CN1231323C - Double-electrode signle gas protective arc welding method and device - Google Patents

Abstract

In a two-electrode one side gas shield arc welding, the groove angle of the stock to be welded is formed into 30-55 deg.C, a backing is abutted to the groove back surface tacked the groove inner surface, steel grit or iron powder is filled within the groove up to the height of 1/4 to 2/3 of the plate thickness of the stock to be welded, the preceding welding electrode wire is rocked at 40-150 times/min and the succeeding welding electrode wire is rocked at 30-120 times/min, and welding is executed at the welding current density of the preceding welding electrode of >=230A/mm<2> , the welding current density of the succeeding welding electrode of >=150A/mm<2>, and the distance between the preceding electrode and the succeeding electrode of 100-600mm.

Description

Double-electrode signle gas protective arc welding method and device

Technical field

The bipolar electrode single face gas shielded arc welding that the present invention relates to the groove that formed by soldered material connects.Especially also be not limited thereto, also relate to the arc-welding apparatus of using than large-current electric arc welding broad groove.

Background technology

In recent years, in the construction of various welding structure things,, in every field, apply the gas shielded arc welding connection rapidly in order to reduce welding cost and to raise the efficiency.Wherein, the utilization in the field of docking high shipbuilding of welding ratio and bridge etc. is more remarkable.But,, mainly be problem from short size to the single fillet welded high speed of long size from the viewpoint that the totle drilling cost of welding reduces.

As one side welding method, as the long steel plate welding of shipbuilding, submerged arc welding method prevailed in the past.The submerged arc welding method shown in the Japanese Patent Publication 60-59072 communique for example can prevent to follow the minimizing of welding bead (Bead) fusion penetration of electrode orbiting and the deterioration of welding bead face shaping especially, can also prevent simultaneously that root from being the crack of welding bead.But this submerged arc welding method is being, facilities and equipments are huge, can not be suitable for because of trouble in short size welding.

The downward welding of gas shield of high current density that adds the welding wire of solder flux in the use shown in the Japanese Patent Publication 61-49027 communique; use the combined wire in carefully straight footpath; it is long that welding wire is extruded length, and weld, reduced welding cost expeditiously downwards with the high speed of welding of big electric current.But, extrude length because of welding wire and reach 35～70mm, so produced target location bad or that cause departing from because of wire bending, and the problem in root pass crack etc. during single-sided welding protected.

In Japanese Patent Publication 50-7543 communique, disclose with the groove of backing material overlap joint in fill steel grit or iron powder in right amount, the method for when shaking thin diameter welding wire, welding.But this method just can not be welded well because of groove gap is not set, so produced the problem long-pending greatly because of the big groove section of bevel angle, that the steel plate operating efficiency is low.

For example at the hull construction of shipbuilding, bridge is made, in the manufacturing of the construction of large-size box or other iron and steel structure or the construction, in the occasion of carrying out to the welding of the groove between two block plates of welding, when welding, make the welding trolley running, weld automatically with the welding torch butt welded seam that is installed on the chassis along weld seam (bearing of trend of groove).To fill the even through welding of metal in order making, thin diameter wire to be cut into cutting (cut) steel wire of particulate or iron powder as filling metal, before welding it being distributed in the groove.(for example Japanese Patent Publication 50-7543 communique).

Thick because of the welding object steel plate, the groove cross section is big, therefore with the bearing of trend vertical direction of groove on shake welding torch, in addition, also have for and improve the welding torch operating efficiency, welding torch more than 2 is loaded on the chassis, carries out the bilayer welding with the once walking of chassis.The applicant has developed this welder and has dropped into practice (for example the special application of special application of Japan flat 8-64705 number and Japan is flat 8-298439 number).

Welding torch more than 2 is loaded on the chassis, also there is following problems in the occasion of carrying out welding more than 2 layers with the once walking of chassis, welding arc electric current thick because of the welding object steel plate, each welding torch is big electric current, in advance the electric arc of welding torch, shake repeatedly at the welding travel direction and in the other direction, owing to welding torch in advance causes the concavo-convex fluctuating on welding bead surface, splashes that it is many to take place, the width change at random of root width etc.

In Japanese kokai publication sho 57-28677 communique, Japanese kokai publication sho 59-107772 communique and Japanese kokai publication hei 8-155643 communique, the unsettled reason and the countermeasure of welding arc disclosed.

Aforementioned Japanese kokai publication sho 57-28677 communique thinks that the mother metal of groove both sides is geomagnetic into mutual polarity, magnetic field occurs on the direction of crosscut groove, and makes welding arc deflection thus on the direction that groove prolongs, and is the unsettled reason of electric arc.Therefore, proposed the electric coil of reeling around welding torch, and, reduced or has offset the arc stability method in the interior magnetic field of groove therein by direct current or alternating current, apply vertical magnetic field with respect to electric arc.But, the problem of this arc stability method is, because of equip big electric coil around welding torch, so welding torch is heavy, and the installation of welding torch becomes difficult, in addition, because of this electric coil being arranged and to the power supply of its power supply, so the cost up of equipment has again, increased and removed attached to the operation of splashing on welding torch and the electric coil, and the operability reduction etc.

Aforementioned Japanese kokai publication sho 59-107772 communique, proposed at the steel of arc welding end face groove part configuration magnetic detector, magnetic direction in the groove and intensity are detected, and on the direction of offsetting it, be installed in electromagnet on the steel end face, the welding arc magnetic blow-out that applies magnetic field in steel prevents method.But, this magnetic blow-out prevents that the problem of method from being, it is only effective in the end of mother metal, because of the detection signal of electromagnet and power supply and processing magnetic detector being installed and controlling the controller that electromagnet is switched on, so equipment cost height, and operation also difficulty, the field operation of welder being moved into the scene of mother metal can not wait in fact.

Aforementioned Japanese kokai publication hei 8-155643 communique proposes, and has the earthy contact of mother metal on walking carriage, by means of with welding torch motion contact, guarantees that near weld part the magnetic blow-out of mother metal ground connection prevents the type welder.But, in this welder, move because of haul thick mother metal ground wire cable with walking carriage, so the operation of pulling mother metal ground wire cable is difficulty very, in addition, even the magnetic blow-out that produces because of the electric current that flows in the mother metal has reduced, but, therefore in the little built-up welding of low current, be restricted etc. relatively poor because of the uneven magnetic blow-out effect that produces of the magnetic before and after the welding torch, very difficult owing to spurring thick mother metal ground wire cable with walking carriage.

Drive a plurality of welding torches this shaking respectively, and weld simultaneously in the welder of same groove with them, the operator must be corresponding to thickness of slab, groove shape (shape of cross section), with the joint quality specification, in welder, set speed of welding (speed of travel of chassis), (shake speed with the welding condition of each welding torch, shake width, welding current, weldingvoltage), but in the occasion of using a plurality of welding torches, not only because of the many setting operation troubles of welding torch number, and from the welding the chassis moving direction, because of the welding condition of the welding torch (the capable welding torch in back) of welding torch of upstream side (welding torch in advance) and downstream side is different, so setting operation also bothers.In order to simplify the setting alter operation that so multiple thickness of slab reaches corresponding with it multiple condition, the various conditions storages that common employing will be scheduled to are input to the method in the IOC.

In the method that the aforementioned storage of the field by using of welding operation is preset, operate a plurality of switches, very trouble.In addition, when setting welding condition as previously mentioned,, after welding operation begins,, adjust or the change welding condition usually according to visual judgement welded condition in that not shown welding firing switch is operated.Though the adjustment of the welding condition in also welding with aforesaid switch, but as previously shown, must carry out switching manipulation repeatedly, till definite (change) setting value, because of setting item (adjustment project) is many, thus in adjusting operation time-consuming and in the increase and decrease direction of the appointment of the project of adjustment and data value is specified, make a mistake easily, operator's burden is very big.

The guide rail parallel with groove is installed on the welding object material, and in the chassis that welding torch will be installed and the welding manner that this guide rail is connected, because of omitting the move operation of welding object material, do not need to carry out the sizable equipment or the space of the moving of welding object material, location etc., so that welding sequence becomes is simple.This guide rail is used the aluminium drawable material for convenient in carrying.Its cross section is the anti-concave shape of spill of reversing up and down, and promptly parallel bipod (heavy section) and the flat part between them are whole to link to each other.Fixing the permanent magnet on the steel plate that is used for fixing at welding object at the lower bottom part of bipod.On the lateral surface of bipod, be overlapped with the profiling roll shaft of welding chassis.But this guide rail is flexible low, is difficult to bending, and is low for the groove welding adaptability of epirelief or the spill steel plate that upwarps.Because of guide rail size long, though so energy slight curvature, but when force to become to follow the usual practice as radius of curvature below tens m epirelief or when upwarping the curved surface of steel plate of spill, the power that applies on guide rail surpasses elastic limit (yield point), guide rail 1 permanent deformation or damage.Therefore, the bending guide rail that in the past must utilize the bending of prebend processing and manufacturing (ordering especially) and steel plate to match, the problem that causes the welding cost of curved plates to increase.

Summary of the invention

The 1st purpose of the present invention is to be in bipolar electrode single face gas shielded arc welding connects; has good single fillet welded welding operation from short size to the welding structure thing of long size; cracking resistance and intact back bead and the weld zone of high tenacity; the 2nd purpose is to be easily long expeditiously steel plate weld job; the 3rd purpose is the instability that is to suppress the electric arc of welding torch; the stable arc position; and the big concavo-convex fluctuating on inhibition welding bead surface; splash and the root width variation; the 4th purpose is setting and the adjustment that is to carry out simply welding condition; even the 5th purpose is to be for the bigger welding object material of bending, also can use the profiling welding of guide rail.

(1) bipolar electrode single face gas shielded arc welding tipping of the present invention is put, it is characterized in that, comprise: will extend, on the Y direction, be provided with groove and 2 blocks of relative soldered materials at directions X, at this groove part go ahead of the rest the gas shielded arc welding torch of welding and the gas shielded arc welding torch that the back row welds; In fact abreast be installed in certain guide rails on one side of aforementioned 2 blocks of soldered materials with aforementioned groove; The running gear that support aforementioned welding torch, moves with aforementioned rail guidance and on directions X; Be equipped on this running gear, support aforementioned welding torch and on the Y direction, drive shake drive unit; Welding current is supplied with the welding supply of aforementioned welding torch; The control device that drive unit, welding supply and running gear are controlled is shaken in aforementioned welding; Supply with the specified device of action indicated value to this control device; , on the first line position of welding torch in advance, cross over aforementioned groove and contact with aforementioned two blocks of soldered materials or magnetic member that approaching magnetic circuit is used along the direction that should move; With magnetic member that keeps this magnetic circuit to use and the jockey that is connected to aforementioned running gear.

Adopt this welder, then the nearest magnetic flux in the place ahead of welding torch carries out displacement in advance, so that flow in the magnetic member that more magnetic circuit in the place ahead is used, therefore the nearest magnetic line of force (magnetic field) in the place ahead of welding torch reduces (dying down), therefore, the unsettled electromagnetic force of rear welding arc of welding torch is weakened, the concavo-convex fluctuating on welding bead surface is low, the generation of splashing reduces sharp, obtains the little root of width variation.

(2) the magnetic member used of aforementioned magnetic circuit comprises: the lower end touches on the soldered material, long and be distributed in the thin magnetic plate that a plurality of legs on the directions X are used on the Z direction; Insert between these plates, be placed on and soldered material between the space of broadness, short and be distributed in the thin magnetic plate of a plurality of Zhi Ganyong on the directions X on the Z direction; Support aforementioned pin with and the device for supporting of the thin magnetic plate of Zhi Ganyong (Figure 10, Figure 11).

(3) the magnetic member used of aforementioned magnetic circuit comprises thicker steel plate and the inclination that this steel plate is connected with aforementioned jockey joint (Figure 15) freely.

(4) the magnetic member used of aforementioned magnetic circuit is included in a plurality of magnetic roll shafts, the rotation that the Y direction extends, distributes and supports their framework and the inclination that this framework is connected with aforementioned jockey joint (Figure 16) freely freely on directions X.

(5) the magnetic member used of aforementioned magnetic circuit is included in a plurality of steel plates that the Y direction extends, distributes and tilts to support freely their framework (Figure 17) on directions X.

(6) aforementioned jockey comprises: be connected and the upwardly extending sliding component in Z side with the magnetic member that aforementioned magnetic circuit is used; With on the Z direction movably, support this sliding component slide guide device (Fig. 1, Figure 10, Figure 15, Figure 16, Figure 17).

(7) contacting or approaching member with soldered material of the magnetic member used of aforementioned magnetic circuit, (Figure 11's direction of going ahead of the rest to the welding torch of going ahead of the rest on the moving direction of running gear Figure 17) tilts.

(8) aforementioned control device comprises and is used for the signal receiver side connector that is electrically connected with aforementioned specified device; Aforementioned specified device be comprise a plurality of variable resistances of the electric signal that expression action indicated value takes place and have is connected with variable resistance respectively, with the welding condition given disc of the signal transmission side-connector of the link of the link disengaging of aforementioned signal receiver side connector.

Adopt this welder, then,, needn't specify the switching manipulation of welding condition so each welding condition is corresponding with each variable resistance because of determining welding condition with variable resistance.Variable resistance directly produce expression action indicated value electric signal, be command signal, because of moving part (slide block or rotating shaft) by means of the operation variable resistance, directly determine the action indicated value, be command value, so the setting of numerical value and adjust simple, the electric wiring number in the welding condition given disc and the electric circuit parts number is few, the welding condition given disc can be provided at low cost simultaneously.

Because of adopting mounting or dismounting mode, the welding condition given disc being linked to each other with control device by connector, so by means of welding condition being set in the welding condition given disc in the place of leaving the welding operation scene, then it is taken the welding operation scene and go and be connected on the control device, just can begin welding.Perhaps, have for example to have set and comprise thickness of slab 9mm respectively, 12mm, 14mm, 16mm, 19mm, 22mm, 25mm be totally 7 the welding condition given disc of welding condition of each thickness of slab correspondence, by means of the corresponding welding condition given disc of selecting with welding object of thickness of slab, and be connected on the control device, just can begin welding.This is the most recommended user mode.In a word, when in welding, adjusting welding condition, because of the moving part of the variable resistance of the welding condition adjusted corresponding to hope by means of operation, directly determine command value, so the adjustment in welding is also extremely simple.

(9) aforementioned a plurality of variable resistance comprises and is used to supply with the variable resistance that shakes rate indicative signal, is used to supply with variable resistance, the variable resistance that is used to supply with the welding current index signal that shakes the width index signal, the variable resistance that is used to supply with the variable resistance of weldingvoltage index signal and is used to supply with speed of travel index signal.

That is to say, because of on the welding condition given disc, comprising 5 variable resistances, concern one to one with resistor and individually to set or to adjust 5 welding parameters, so the setting of welding condition or adjust simple because of using.

(10) aforementioned each resistor is the variable resistance that has the locking mechanism of the moving part motion that locks resistance value setting usefulness.

On the welding condition given disc, set welding condition in the place of leaving the welding operation scene, this given disc is taken the welding operation scene, and be installed in occasion on the welder, for example comprising setting thickness of slab 9mm respectively, 12mm, 14mm, 16mm, 19mm, 22mm, in the welding condition given disc of the welding condition of each thickness of slab correspondence of 25mm, by means of the welding condition given disc of selecting corresponding to the thickness of slab of welding object, and be connected to any one occasion on the control device, before on the welder given disc being installed, the moving part of variable resistance is because the position of touching moving part of object or staff may be moved (set point change) entirely, but the skew of this setting value then by means of setting or adjustment back locking moving part in welding condition, can not take place in the employing present embodiment.Control device is installed on running gear, and its signal input side connector is installed under the state on the welding condition given disc, to be sent to because of the vibration that shaking of welding torch produces on the given disc by control device, when the mechanical resistance to sliding of the moving part of variable resistance or rotary resistance low (slide or rotate), though might make moving part deviation post (set point change) because of vibration, but by means of the locking moving part, the skew of this setting value can not take place.

(11) aforementioned each variable resistance is a variable resistance of having settled the dial type of knob on the rotation moving part of resistance value setting usefulness.As everyone knows, because of the variable resistance of dial type is directly found out indicated value with reference to scale, so the setting of welding condition and adjustment are easily.

(12) also be included in the place ahead of direction of travel on the directions X, with the filling metal feedway of aforementioned running gear supporting.Adopt this welder, then can in welding, in groove, supply with automatically in advance and fill metal, do not need to distribute and fill the manually-operated of metal, welding operation efficient height with filling the metal feedway.

(13) aforementioned guide rail also comprises: 2 guide rails that directions X extends and be dispersed in multiple spot on the directions X a bit on be fixed on aforementioned 2 guide rails, and on other aspect, on directions X, relatively slide, in fact the chucking relation be combined on the Y direction on aforementioned 2 guide rails, on the Y direction, put the connecting plate that connects aforementioned 2 guide rails with predetermined distance abreast.

Adopt this welder, though then 2 guide rails and connecting plate reciprocally are fixed on any of directions X (long axis direction), but because of on other aspect, 2 guide rails and connecting plate can relatively slide on directions X, so when forced guide rail during along the curved surface of epirelief or the spill steel plate that upwarps, each root of 2 guide rails and connecting plate bending, at this moment, 2 guide rails and connecting plate relatively slide.That is to say,, can not take place because the different local area stress of curvature is concentrated owing to the difference of the different bendings that cause of separately curvature is relatively slided.That is to say that this slip can discharge the distortion between 2 guide rails and the connecting plate.

Therefore, the elastic limit of 2 guide rails and connecting plate improves more than the occasion of their overall fixed on the directions X total length, and the radius of curvature that permanent deformation or destruction can not taken place becomes littler.That is to say, easily crooked, and be difficult to permanent deformation, be difficult to produce damaged, not only for the plane, even and for the curved surface of various curvature, also higher adaptability arranged.

(14) connecting plate of aforementioned guide rail, be distributed in multiple spot on the directions X a bit on utilize stop spiral shell pin to be fixed on aforementioned 2 guide rails, and on other aspect, pass the long slotted hole on directions X of connecting plate, the screw that utilization screws in guide rail relatively slides on directions X, is being combined on aforementioned 2 guide rails to the chucking relation in fact on the Y direction.

Because of utilizing its screw of slotted hole and break-through, connecting plate is keeping sliding relation on the guide rail, on directions X, thus become integral body at guide rail and connecting plate substantially, with identical in the past, the carrying of guide rail and be easy to the installation of steel plate.

(15) aforementioned guide rail also further comprises: be distributed in multiple spot on the directions X a bit on be fixed on the connecting plate, and on other aspect, on directions X, relatively slide, chucking is combined in tooth bar on the connecting plate with concerning in fact on the Y direction.

Wheel or roll shaft, rotation driving wheel or roll shaft by means of with the rail guidance running gear though make the running gear walking along guide rail, probably have wheel or roll shaft to slide for guide rail.Therefore, for the speed of travel is correct, preferably with identical in the past, it is good on the guide rail that tooth bar is installed in, but this tooth bar also makes the flexibility decrease of guide rail.That is to say that guide rail is difficult to bending.

But, in the present embodiment, because of tooth bar is being slidably mounted on the connecting plate on the directions X relatively, so tooth bar and connecting plate bending easily respectively in elastic limit, not only for the plane, even and for the curved surface of various curvature, also higher adaptability arranged.

(16) aforementioned tooth bar, be distributed in multiple spot on the directions X a bit on utilize stop spiral shell pin to be fixed on the connecting plate, and on other aspect, pass the long slotted hole on directions X of connecting plate, the screw that utilization screws in tooth bar relatively slides on directions X, is combined on the connecting plate to the chucking relation in fact on the Y direction.Because of utilizing this slotted hole and passing its screw, at the tooth bar that keeps sliding relation on the connecting plate, on directions X, thus become integral body guide rail, connecting plate and tooth bar three substantially, with identical in the past, the carrying of guide rail and be easy to the installation of steel plate.

(17) double-electrode signle gas protective arc welding method of the present invention is characterized in that, in the bevel angle 30～55 of soldered material.Y or the groove place of V-arrangement overlap joint backing material, in this groove, fill steel grit or iron powder to the height below 2/3 1/4 or more of soldered material thickness of slab, also be hinged with (1) described bipolar electrode single face gas shielded arc welding and put when this groove carried out single-sided welding; in this groove, fill steel grit or iron powder the height below 2/3 more than 1/4 to soldered material thickness of slab; order in advance and the anode-cathode distance between the welding electrode welding wire of back row below the above 600mm of 100mm, in advance and the welding current density of the welding electrode welding wire of back row respectively at 230A/mm ²More than and 150A/mm ²More than, and with more than 40 times/minute below 150 times/minute and more than 30 times/minute below 120 times/minute, shake and drive in advance and the welding electrode silk of back row respectively.

Adopt the present invention, welding efficiency height then, the generating capacity that splashes during welding is few, and can obtain the good welding bead of outward appearance.

(18) groove is the groove of location welding inner face.

(19) the welding electrode welding wire of going after contains percentage by weight for the welding wire total weight and is:

TiO ₂: more than 2.5% below 7.0%

ZrO ₂: more than 0.4% below 1.0%

Al ₂O ₃: more than 0.1% below 1.0%

Si:0.2% is above below 1.2%

Mn:1.0% is above below 4.0%

Mg:0.1% is above below 1.0%

And be the welding wire that contains solder flux that adds up to the solder flux below 0.3% more than 0.03% of having filled a kind of of Na and K or 2 kinds.Adopt the present invention, then can obtain the welding bead of high tenacity.

(20) back row welding electrode welding wire has also recharged for the welding wire total weight and has contained percentage by weight and be:

Ni:0.3% is above below 3.0%

Ti:0.02% is above below 0.2%

B:0.002% is above below 0.015%

The welding wire that contains solder flux of solder flux.Adopt the present invention, then can obtain the high welding bead of cracking resistance.

(21) at least with the 1st protective gas and the 2nd protective gas duplicate protection electrode wire of going ahead of the rest.Adopt the present invention, the generating capacity that then splashes reduces, and can obtain the good welding bead of outward appearance.

Description of drawings

Fig. 1 represents the summary stereogram of outward appearance of the welder of one embodiment of the invention, is depicted as the state in the welding.

Fig. 2 represents to drop into the stereogram of the state of cut welding wire in groove in the welder of embodiment shown in Figure 1, before welding.

Fig. 3 represents in the welder of embodiment shown in Figure 1, the front view of welding torch Tf, Tb.

Fig. 4 represents to be equivalent to the cutaway view of the sensor head motion 5f of 4A-4A line section among Fig. 3.

Fig. 5 represents the block diagram of system architecture that welding torch Tf in advance shown in Figure 1 and back row welding torch Tb are shaken, has provided welding object material WR, WL stereogram.

Fig. 6 represents to be equipped in the amplification longitudinal section of the duplicate protection 100b on the welding torch Tb shown in Figure 1.

Fig. 7 represent between electrode wire 9f in advance shown in Figure 1 and the back column electrode welding wire b distance, be the side view of anode-cathode distance Dw.

Fig. 8 represents the welding current value and the relation of the generating capacity that splashes, and previous methods represents it is the occasion of single protection.

Fig. 9 is illustrated in the welder shown in Figure 1, when the groove of soldered material of the multiple thickness of slab of welding, and the graph of a relation that the combination of thickness of slab and steel grit distribution height distributes, attached with the whether good label of back bead shape on combined spot.

Figure 10 represents the amplification stereogram of magnetic circuit member 210 shown in Figure 1.

Figure 11 represents 11A-11A line cutaway view among Figure 10.

Figure 12 represents 12A-12A line cutaway view among Figure 11.

Figure 13 represents the magnetic circuit member 210 of welder shown in Figure 1 and the plane of welding wire 9f and welding object material WR, WL.

It is that the length of 200mm, groove bearing of trend is the plane of the allocation position of 220mm, the thickness flux measuring probe MS when being the steel plate used of any magnetic flux shunts of 22mm, the groove α between welding work pieces (work) WR, WL that Figure 14 (a) is illustrated in width that magnetic circuit member 210 with welder shown in Figure 1 changes the Y direction into.

The relation of the position (probe MS starting point) of the welding torch Tf in advance when Figure 14 (b) is this welding of expression and the measured value of probe.

Figure 15 represents to be used for to replace the stereogram of outward appearance of the magnetic circuit member 220 of magnetic circuit member 210 shown in Figure 1.

Figure 16 represents to be used for to replace the stereogram of the outward appearance behind the cut-out of magnetic circuit member 230 of magnetic circuit member 210 shown in Figure 1.

Figure 17 represents to be used for to replace the stereogram of outward appearance of the magnetic circuit member 240 of magnetic circuit member 210 shown in Figure 1.

Figure 18 represents the amplification stereogram that blocks the automatic distribution apparatus 100 of welding wire shown in Figure 1.

The amplification view of the welded condition of Figure 19 (a) expression groove A/F hour.

The amplification view of the welded condition when Figure 19 (b) expression groove A/F is big.

Figure 20 represents the amplification stereogram of guide rail shown in Figure 1 400.

Figure 21 represents the amplification view of the right side of the guide rail 400 seen from the direction of 21A shown in Figure 20.

Figure 22 represents the amplification view of vertical cross-section of the guide rail 403 of 22A-22A shown in Figure 20.

Figure 23 represents the amplification view in vertical vertical section of the guide rail 403 of 23A-23A shown in Figure 20.

Figure 24 represents the sectional elevation of the walking mechanism part of chassis shown in Figure 11.

Figure 25 represents the amplification view of the outward appearance of welding condition given disc 30 shown in Figure 1.

Figure 26 represents the electrical circuit diagram of the cloth line states of welder shown in Figure 11.

Figure 27 is illustrated in the arc-welding apparatus shown in Figure 1, the workpiece WR in welding behind the removal magnetic circuit member 210, the plane of WL.

Figure 28 is illustrated in the arc-welding apparatus shown in Figure 1, the workpiece WR in welding behind the removal magnetic circuit member 210, the side view of WL, and wherein a part is depicted as the vertical section.

Figure 29 (a) is illustrated in the arc-welding apparatus shown in Figure 1, the plane of the allocation position of the flux measuring probe MS when removing the groove α between magnetic circuit member 210, welding work pieces WR, WL.

The relation of the position (probe MS starting point) of the welding torch Tf in advance when Figure 29 (b) is this welding of expression and the measured value of probe.

Figure 30 represents the stereogram of the outward appearance of guide rail in the past.

Figure 31 represents the block diagram of structural outline of the control panel of welder in the past.

The specific embodiment

Below, with reference to accompanying drawing embodiments of the invention are described.

Fig. 1 represents the summary of the outward appearance of one embodiment of the invention.In welder shown in Figure 1, with 2 root bead torch Tf, the bipolar electrode of Tb carries out CO ₂The gas shield single-sided welding is welded groove α on the direction X of its extension.The workpiece WR of horizontal Tile, WL docks its face-to-face opposing end faces mutually, and forms groove α between two workpiece.Guide rail 400 is configured on the workpiece WR abreast with groove α, is installed in the chassis 1 on this guide rail 400, moves on directions X along guide rail 400.The 50th, prevent that motlten metal from burning the run-on tab of usefulness.

Chassis 1 is by the casing of scaffold 12 from following surface bearing built-in control circuit 20.Welding torch head motion 6f and back row welding torch head motion 6b in advance are installed on chassis 1.

Welding torch head motion 6f is by the welding torch supporting device 80f that goes ahead of the rest in advance, and supporting is welding torch Tf in advance.Control circuit 20 shake controller Cof (Figure 26) the control driving of the motor of welding torch head motion 6f in advance so that use corresponding to from welding condition given disc 30 shake width signal and shake the vibration width of rate signal and shake number of times/minute, shake and drive welding torch Tf in advance.Like this, in advance welding torch Tf with the rectangular direction Y of chassis direct of travel X (bearing of trend of groove α) on shake (reciprocating motion).

Back row welding torch head motion 6b is by back row welding torch supporting device 80b, supporting back row welding torch Tb.The driving of the motor that shakes controller Cob (Figure 26) control back row welding torch head motion 6b of control circuit 20, so as to use corresponding to from welding condition given disc 30 shake width signal and shake the vibration width of rate signal and shake number of times/minute, shake and drive back row welding torch Tb.Like this, back row welding torch Tb with the rectangular direction Y of chassis direct of travel X (bearing of trend of groove α) on shake (reciprocating motion).

On the side of the in advance side of scaffold 12 and back row side, install in advance welding torch Tf in advance with and back row welding torch Tb the wire reel 18f and the 18b that use, and the welding wire wf that reels thereon, wb.Supply with motor 19f when a welding wire that drives scaffold 12, during 19b, just with Wf, Wb supplies with welding torch Tf, Tb.

On the support rod 13 that is fixed on the chassis 1, the bridging utensil 200 that is used to form the magnetic circuit that crosses groove α is installed.Constitute this bridging utensil 200 with connecting elements (201～209) and magnetic circuit member 210.Utilization is tightened in stop screw not shown on the support rod 13, and the slide block 201 of this connecting elements is fixed on the support rod 13.The elevating mechanism 202 that has knob is installed, and this elevating mechanism 202 is supporting sleeve 203 on slide block 201.When the operator is rotated in the forward or during the knob of reverse rotation elevating mechanism 202, sleeve 203 just to Z upward to or downward direction move.

The slide bar 204 that extends in the Z direction passes sleeve 203, and utilizes the stop screw of twisting people's sleeve 203, and slide bar 204 is fixed on the sleeve 203.Utilize welding, sleeve 205 is fixed on the lower end of slide bar 204, and utilize and weld, will be fixed on this sleeve 205 at the upwardly extending arm 206 in Y side.Utilize the front end that welds, guide sleeve 207 is fixed on arm 206.Slide bar 208 passes the endoporus of this guide sleeve 207, and this slide bar 208 can move on the Z direction.Ride over the lower end that magnetic circuit member 210 on workpiece WR, the WL is fixed on slide bar 208.

Between magnetic circuit member 210 and guide sleeve 207, insert the compression helical spring 209 that passes bar 208, this compression spring 209 usefulness guide sleeve 207 support, and magnetic circuit member 210 is pressed on goods WR, the WL.When chassis 1 in directions X walking, when the top plane of goods WR, WL raises, when magnetic circuit member 210 rises on this plane, rise while compress spring 209.That is to say that guide sleeve 207 and spring 209 can be finished magnetic circuit member 210 and move for the profiling on plane on the workpiece.

In the control circuit 20 in the casing on scaffold 12, controller Cof, Cob and the walking carriage controller Cm of shaking described later arranged.The signal receiver side connector 20a of control circuit 20 links to each other with the signal outlet side connector of welding condition given disc 30, thus, given disc 30 is connected on the welding condition given disc 30 mutually with control circuit 20, is useful on welding current, the weldingvoltage of specifying welding torch Tr and back row welding torch Tt in advance, shakes width and shakes the variable resistance of the speed of travel (speed of welding) of number of times (inferior/minute) and chassis 11.Correspond respectively to that the welding object material should be adjusted or the welding condition of appointment, adjust or set (appointment), and other adjustment, setting or indication are carried out with the dial (variable resistance) of operation panel 21, switch etc. with given disc 30.

Fig. 1 has provided the state in the welding, puts into to block welding wire cw as packing material in groove α.As shown in Figure 1, in the present embodiment, weld preceding, in groove α, put into and block welding wire cw.Figure 18 represents packing material feedway 300, and its details is put in groove α when blocking welding wire cw as described later, from support rod 13 aforesaid bridging utensil 200 is sloughed, and replaces packing material feedway 300 is installed on support rod 13.The connecting elements of packing material feedway 300 also has identical structure with the connecting elements (201～206) of bridging utensil 200.

Fig. 2 has represented packing material feedway 300 is installed on support rod 13, drops into the state of cut welding wire cw in groove α.At this moment, though chassis 1 is walked on directions X, weld without welding torch Tf, Tb.Drop in the groove α zone of cut welding wire cw without packing material feedway 300 in the domain of walk that exceeds chassis 1, add people's cut welding wire cw by the operator.In addition, throw man-hour at the cut welding wire, the direction of advance (+directions X) when chassis 1 can be with welding is equidirectional, also can be rightabout (X) direction.In addition, also bridging utensil 200 and packing material feedway 300 can be installed simultaneously on support rod 13, to groove α in drop into cut welding wire cw and on one side weld on one side.

In addition, on the top of chassis 1, from the framework 7 of following supporting box 20, have switch, indication welding torch Tf, Tb that supporting comprises the forward/backward of indicate chassis 1 separately on/accessory that the manual operation end 9f (Fig. 4) of the switch that begins/stop to be welded in the switch that moves down and indication, manual operation end 9f can take off from framework 7, in the present embodiment, take off, use manual operation end 9f from framework 7.Fig. 4 is illustrated in the state that manual operation end 9f is installed on the framework 7 with double dot dash line.Below, explain the structure of each several part.

A. welding torch, head motion and groove sensor

Fig. 3 represents the front of welding torch Tf, Tb, and Fig. 4 represents sensor vibrating mechanism 5f.In addition, also vibrometer is shown below and shakes.First line sensor vibrating mechanism 5f is installed on chassis 1.The framework 51 of sensor vibrating mechanism 5f is fixed on the chassis 1, sensor vibrating motor M5f is arranged in the inside of framework 51, its rotating shaft extends upward right-hand, and is connected on directions X the left end that extends, rotates supporting screw 52 freely.Utilize the rotating shaft rotation drive screw 52 of motor M5f.Slide block 54 is connected with screw rod 52 by screw thread, and the guide rail 53 of the bottom surface by being laid on framework 51 on directions X, can not rotate directions X forward/backward ground guide shoe 54 only.When motor M5f was rotated in the forward, screw rod 52 rotations were upward moved with guide rail 53 guide shoe 54 and at directions X (right).When motor M5f reverse rotation, slide block 54 direction left moves.

Fixing on directions X at the right-hand member of slide block 54 extend, from the outstanding support rod 55f of the right flank of framework 51.On the front end of support rod 55f, fixing the upper end of arm 41, and fixing upwardly extending arm 42 in Y side in its lower end.Arm 41 and 42 is combined into inverted T-shape.Oriented right-hand outstanding columniform pivot pin on the right flank of arm 42, and with thumbscrew 44 supporting arm 43 is fixed on this pivot pin.The line sensor Sf of elder generation is the electric conductor welding wire, by the front end reach through hole of supporting arm 43, and is fixed on the supporting arm 43 with thumbscrew 45.By means of loosen thumbscrew 44, with respect to pin 44 swivel bearing arms 43, can adjust angle for the first line sensor Sf of Z axle, be shifted up and down by means of loosening 45 couples of first line sensor Sf of thumbscrew, can adjust the degree of depth that enters for the front end of the first line sensor Sf of groove.When changing first line sensor Sf or place under repair (removing splashing of lining), also can loosen thumbscrew 45 and take out first line sensor Sf.

The line sensor Sf of elder generation is the electric conductor welding wire, and supporting arm 43,41 and support rod 55f are that electric conductor (steel) is fixed on support rod 55f on the slide block 54 by insulator.That is to say that first line sensor Sf, supporting arm 43,41 and support rod 55f are an integral body on electric, and they are become the slide block 54 and framework 51 insulation of machine earth level.That is to say electric going up and the isolation of machine ground level.In framework 51, will be wired on the support rod 55f, and this electric guide line will be connected in the contact detection circuit 110 shown in Figure 5.

The substrate of the welding torch vibrating mechanism 6f that goes ahead of the rest is fixed on the framework 51 of first line sensor vibrating mechanism 5f.In advance welding torch vibrating mechanism 6f comprises the electronic torch height guiding mechanism that drives supporting arm 81 up and down and supports this torch height guiding mechanism and shake (vibration) on the directions X that supporting arm 81 extends and drives its electronic head motion, indicate corresponding to operator's rising (UP), descend (DOWN), drive supporting arm up and down, in addition, vibratory drive (shaking driving promptly repeatedly come and go to drive) supporting arm 81 on directions X automatically in welding.

Supporting arm 81 supports welding torch Tf in advance by welding torch supporting device 80f.Be marked with the expression scale of the directions X amount of movement of welding torch Tf in advance at supporting arm 81.With reference to Fig. 3 and Fig. 4, welding torch supporting device 80f by the supporting disk 82 of the roughly isosceles triangle that stands upside down, utilize pin 86 to form with pin 86 rotating disc 83 that be the center rotate with the YZ plane parallel and the welding torch clamping components 87 that utilizes screw 85 to be fixed on the rotating disc 83 for supporting disk 82 freely from the rotation of surface bearing down by supporting disk 82.Utilize screw 81a that supporting disk 82 is fixed on the right part of supporting arm 81.It is that the track at center is the guiding groove of circular arc that the circular hole of being opened with its bottom is arranged on the top of supporting disk 82, the stop screw 84 that guiding is inserted from the left side of supporting disk 82.Rotating disc 83 is long rectangle in the Z direction, has the circular hole of guiding pin 86 in its lower end.Insert pin 86 in the hole that open the lower end of the lower end of rotating disc 83 and supporting disk 82, the lower end of pin 86 supporting rotating discs 83 can rotate freely with respect to the lower end of supporting disk 82.Top at rotating disc 83 has screw hole, and the guide groove of perforating branch tray 82 is the right part and the threaded engagement of outstanding stop screw 84 also.By means of tightening stop screw 84, rotating disc 83 closely is fixed on the supporting disk 82.

The operator loosens stop screw 84, be benchmark with pin 86, in the guide groove of supporting disk 82 in the scope of reference position guiding stop screw 84 (15 °) from the reference position, make rotating disc 83 rotations, and screw tight stop screw 84, rotating disc 83 be fixed on the supporting disk 82 in desired angle.Utilize the go ahead of the rest welding torch clamping components 87 of welding torch Tf of screw 85 fixed bearings on rotating disc 83, be accompanied by the rotation of rotating disc 83, welding torch Tf can make its front end rotation in advance.Therefore, can adjust angle for the welding torch Tf of Z axle (on the Y direction with respect to advance side, retreat the inclination of side).

Because of the supporting structure of the vibrating mechanism (4b, 5b, 6b, 80b) of back row welding torch Tb and back line sensor Sb and chassis 1 is identical with the mechanism (4f, 5f, 6f, 80f) of aforesaid go ahead of the rest welding torch Tf and first line sensor Sf, so omit its detailed explanation.

Fig. 5 has provided the system architecture that go ahead of the rest welding torch Tf and first line sensor Sf are vibrated.Because of also identical with system's formation that back line sensor Sb vibrates, so omit relative diagram with it to back row welding torch Tb.Here, the control circuit 20 of Fig. 5, system of vibrating in advance welding torch Tf and first line sensor Sf and the system of vibrating for back row welding torch Tb and back line sensor Sb are all general.

Connect support rod 55f in contact detection circuit 110, by this support rod 55f and supporting arm 43,41, the electric electric guide line that forms integral body of going up is connected on the first line sensor Sf, the ground level of electric rising machine is isolated.Contact detection circuit 110 applies fixed voltage by resistor on this electric guide line, formerly line sensor Sf is not during any one among contact workpiece WL, the WR, the current potential that this electric guide line is this fixed voltage (high level H), during any one among line sensor Sf one contact accessory WL, the WR, just become machine ground level (low level L) in the ban.Contact detection circuit 110 will be represented 2 value signal supply control circuits 20 of this contact (low level L), noncontact (high level H).When control circuit 20 drives first line sensor Sf on the right side, 2 value signals one switch to low level L from high level H, just judge that first line sensor Sf touches on the accessory WR, when driving first line sensor Sf on a left side, 2 value signals one switch to low level L from high level H, just judge that first line sensor Sf touches on the accessory WL.

By aforesaid sensor vibrating mechanism 5f, first line sensor Sf is in vertical direction X (left and right directions) vibration with respect to the bearing of trend Y of groove.The sensor vibrating motor M5f of sensor vibrational structure 5f is a stepping motor, by motor driver MDf1 and utilize control circuit 20, controls its direction of rotation and rotation amount (number of steps).When control circuit 20 indication driver MDf1 were just changeing motor M5f, driver MDf1 was applied to the just commentaries on classics pulse voltage of specified period on the motor M5f, thus, motor M5f stepping rotation (just changeing), first line sensor Sf moves to right-hand.On the contrary, when control circuit 20 indication driver MDf1 made motor M5f counter-rotating, driver MDf1 was applied to specified period inversion pulse voltage on the motor M5f, and thus, motor M5f stepping rotation (counter-rotating), first line sensor Sf moves to left.Control circuit 20 will just change index signal or counter-rotating index signal supply with driver MDf1 during, driver Mdf1 continues the rotation driving pulse voltage of specified period is supplied with motor M5f, motor M5f rotates continuously.

On the other hand, by aforesaid welding torch vibrating mechanism 6f, in advance welding torch Tf is in vertical direction X (left and right directions) vibration with respect to the bearing of trend Y of groove.The vibrating motor M7f of welding torch vibrating mechanism 6f is a stepping motor, by motor driver MDf2 and utilize control circuit 20, controls its direction of rotation and rotation amount (number of steps).When control circuit 20 indication driver MDf2 were just changeing motor M7f, driver MDf2 was applied to the just commentaries on classics pulse voltage of specified period on the motor M7f, and thus, motor M7f stepping rotation (just changeing), welding torch Tf moves to right-hand in advance.On the contrary, when control circuit 20 indication driver MDf2 made motor M7f counter-rotating, driver MDf2 was applied to specified period inversion pulse voltage on the motor M7f, and thus, motor M7f stepping rotation (counter-rotating), the welding torch Tf that goes ahead of the rest moves to left.Control circuit 20 will just change index signal or counter-rotating index signal supply with driver MDf2 during, driver MDf2 continues the rotation driving pulse voltage of specified period is supplied with motor M7f, motor M7f rotates continuously.

Control circuit 20 usefulness come and go turntable driving (vibratory drive) sensor Sf, Sb with the cycle that speed of welding (Y direction) is inversely proportional at directions X, with the operator weld the welding torch position of setting before the beginning (directions X) be the center, about carry out the vibration width that the operator sets welding torch vibrate, and on directions X, the center of vibration width is moved, move the changing unit of the groove center that size obtains for the vibration that utilizes sensor.That is to say, carry out the vibration of the width set the enterprising line operate persons of welding condition given disc 30, and equidirectional the center of vibration is moved, move the changing unit of the directions X of the groove center that size obtains for the vibration that utilizes sensor.

Welding condition given disc 30 supplies to vibration width and welding condition (speed of welding, welding current value and other) in the control circuit 20.Switch by means of adversary operating side 9f is operated, and the operator carries out the X position adjustment of the chassis 1 on workpiece WR, and for the adjustment (adjustment of Z position) of the height of the welding torch of goods, the Y position of welding torch is adjusted and the Y position adjustment of sensor.

Dual-seal 100f and 100b are installed in respectively on the front end of welding torch Tf and Tb.Fig. 6 amplifies the longitudinal section that expression is installed in two resealing Tb on the welding torch Tb.Welding torch Tb delivers to weld seam 9b in the groove from the welding tip WC of its front end, and discharges protective gas.Two resealing 100b are installed on this welding torch Tb.Two resealing 100b comprise the annex 101 that is fixed on the welding torch Tb, are fixed on inner nozzle 102 and outer nozzle 103 on this annex 101.Inner nozzle 102 surrounds bonding pad WC, and will be directed to the below from the protective gas (the 1st protective gas) that welding torch Tb discharges along bonding pad WC.This 1st protective gas be discharged to from the lower ending opening of inner nozzle 102 outside that is exposed to sheet WC weld seam 9b around.Outer nozzle 103 the latter halfs are extended to coniform, from the outside of welding torch Tb the 2nd protective gas are supplied with this outer nozzle 103, and it is discharged the outside at the 1st protective gas along the outer surface of inner nozzle 103 from lower ending opening.With the welding portion under first protective gas and the 2nd protective gas two-fold protection welding torch 9b.Below, the state that will apply and discharge the 2nd protective gas on the 1st protective gas is called " duplicate protection ", and the appearance of only discharging the 1st protective gas is called " non-duplicate protection " or " single sealing ".The structure of duplicate protection 100f is identical with the structure of duplicate protection 100b.

As shown in Figure 7, in advance, the interelectrode distance between back row welding wire, be that anode-cathode distance Dw is along the welding electrode welding wire 9f in advance of the groove of accessory and the distance of back row welding electrode welding wire 9b.As described later, anode-cathode distance Dw is less than 100mm electric arc instability then, and back bead is too outstanding, and when surpassing 600mm, though improve toughness effectively, it is big that device becomes, so can not be satisfactory.

Figure 8 shows that welding current and the relation of the generating capacity that splashes.If duplicate protection, then compare with method (single sealing) in the past, change irrelevantly with electric current, and the generating capacity that splashes is below 2.0g/min.

Figure 9 shows that the steel grit distribution height that the bipolar electrode single face gas shielded arc welding of multiple thickness of slab connects and the relation (the various conditions of welding at this moment are as shown in table 2) of interior weld bead shape.In addition, the circular label on Fig. 9, triangle label, * label is represented measuring point, and weld bead shape was good in circular label was represented, and weld bead shape was bad in the triangle label was represented, and weld bead shape is very poor or grill thoroughly in * number the expression.

As shown in Figure 9, in the groove of each thickness of slab, steel grit is distributed in the height below 2/3 more than 1/4 of thickness of slab and welds, then in the shape of welding bead good.Distribution height surpasses 2/3 o'clock of thickness of slab, then or interior weld bead shape very poor or can not form interior welding bead.In addition, less than 1/4 o'clock, welding takes place come off.

B. magnetic circuit member 210 of magnetic line of force bridge formation usefulness etc.:

The present inventor studies the unsettled reason of welding arc of the welding torch of going ahead of the rest 2 welding torches being installed on the chassis, carrying out in the welding of the steel plate of welding more than 2 layers in per 1 walking of chassis.At first, in the occasion of using 2 welding torches, during aforesaid problem appears at and welding torch welds in advance, in the welding of back row welding torch in fact aforesaid problem does not appear.If notice this point, see that promptly welding torch is different with the welding surroundings of back row welding torch in advance, to the place ahead of the welding torch moving direction (welding direction) of welding torch in advance is groove, the rear is a welding bead, then going the place ahead and the rear of welding torch all is welding bead, the welding bead in the place ahead (being formed by welding torch in advance), also is the temperature (magnetic) below the curie point (Curie ' s point) in the dead ahead of back row welding torch.

Therefore, shown in double dot dash line among Figure 27, about the welding torch of going ahead of the rest, because arc current has formed magnetic field, though the magnetic line of force flows through welding object steel plate WR, WL, but because of the place ahead is a groove, what the rear was close is nonmagnetic material (welding bead that curie point is above), and the rear is magnetic (less than the welding bead of curie point) at a distance, so at the rear of the weld seam 9f of welding torch in advance, the magnetic line of force is around arriving great distances, therefore at rear near weld seam 9f, magnetic flux density (magnetic field) rare (weak), but the place ahead at weld seam 9f, because of the place ahead is groove (space), so the magnetic line of force can be around not arriving great distances, therefore in the place ahead magnetic flux density (magnetic field) close (by force) near weld seam 9f.In addition, though distribution cut welding wire cw is as filling metal in groove, the bypass effect of the magnetic line of force of cut welding wire is low, even this occasion also can similarly be considered.As previously mentioned, when the place ahead magnetic flux density height at the welding torch welding wire 9f of welding torch in advance when magnetic flux density is low in the wings, left hand rule according to Fu Laiming (Fleming), because the effect that the magnetic line of force in the place ahead can produce power P to welding arc, thus, as shown in figure 28, welding arc with the rightabout of welding torch direction of advance on vibrate.

During representing to weld, Figure 29 follows the variation of welding the magnetic line of force that carries out at 1 of groove.Shown in Figure 29 (b), in the welding of leaving steel plate WR, WL finishes the groove of side (run-on tab side) 500mm position, insert the front end (magnetic flux inspection end) of the probe MS of flux measuring device, be set in the altitude range of the following 8～10mm that leaves steel plate, and begin the bipolar electrode welding of following condition, and gather the measured value of the probe MS when go up each position (numerical value of the axis of abscissas among the figure: leave the distance that the magnetic line of force locates) of welding torch axis of abscissas on Figure 29 in advance from the run-on tab side.Its result is illustrated among Figure 29 (a).In addition, the point of the blacking in the groove α of Figure 29 (b) is the tack welding contact.

-welding condition-

Welding object steel plate WR, WL: material SM490A,

Thickness 19mm,

Length 3000mm,

Each width 1.1m

Groove: the double V-groove of bevel angle 50 degree, cut welding wire distribution height 8mm

Welding torch in advance: electric current 540A-voltage 42V

Vibration: width 8mm, number of times 90 times/minute

Weld seam: YM-55H, φ 1.6, the solid welding wire

Back row welding torch: electric current 450A-voltage 40V

Vibration: width 5mm, number of times 60 times/minute

Weld seam: SF-1, φ 1.6, tape welding agent welding wire

Mother metal ground connection: with two block plate WR, WL is whole each bight of rectangle, altogether 4 points

By Figure 29 (a) as can be known, along with welding torch is near measuring point (MS) in advance, the magnetic flux of measuring point (MS) rises sharp, and the close magnetic flux in welding torch the place ahead (400mm the place ahead) in advance is the numerical value up to 160 Gausses.

Here, the present inventor considers to place in the place ahead of welding torch in advance the steel plate (below be called the steel plate that any magnetic flux shunts is used) that the groove between welding object steel plate WR and the WL is carried out the magnetic bypass, it is moved with the welding torch of going ahead of the rest equidirectionally, cross the close magnetic line of force in the place ahead of welding torch in advance at the steel plate effluent of magnetic line of force biasing usefulness, and weaken near magnetic field, the place ahead of welding torch in advance (welding torch and the magnetic line of force are setovered between the steel plate of usefulness) in advance, thus, carry out the experiment identical with previous experiments.Its result, as shown in figure 14, the magnetic line of force condition determination of this experiment, identical with occasion without the steel plate of magnetic line of force biasing usefulness, welding condition is also as hereinbefore.But, in the place ahead by the welding torch 150mm that goes ahead of the rest, installation cross the groove direction width 200mm, extend the steel plate of magnetic line of force biasing usefulness of length 120mm, the thickness 22mm of groove direction, so that the leap groove, this any magnetic flux shunts moves with the supporting of welding chassis and with the welding torch of going ahead of the rest in the same manner with steel plate.That is to say, in welding, between the steel plate of the weld seam of welding torch in advance and magnetic line of force biasing usefulness, remain the space of 150mm, and side by side drive them in welding direction (directions X that groove extends).Groove α and the flux measuring probe MS of Figure 14 (b) expression welding steel WR, WL., the point of the blacking in the groove α of Figure 14 (b) is the tack welding contact.

Flux measuring value when the solid line of Figure 14 (a) is represented with the steel plate of magnetic line of force biasing usefulness.In the time of before welding torch is depending on flux measuring point (MS) 400mm in advance, by the magnetic flux in welding torch the place ahead never 160 Gausses the during steel plate of magnetic flux biasing usefulness reduce to 63 Gausses, cross the steel plate of magnetic flux biasing usefulness greatly to magnetic flux flow, as seen adopt the magnetic flux biasing effect of this steel plate fine.When this welding, the electric arc of welding torch is minimum with the rightabout vibration of welding travel direction in advance, and the wavy gravy on welding bead surface is not obvious, and the generation of splashing sharply reduces, and can obtain the little root of amplitude variation.That is to say that the effect of as seen improving aforementioned problem in the past is high.

This can think because many and flow through the result of the steel plate of magnetic flux biasing usefulness near the magnetic flux in the place ahead of welding torch in advance.Compare with the magnetic flux distribution (Figure 27) of the steel plate that does not have magnetic flux biasing usefulness, when using the steel plate of magnetic flux biasing usefulness, shown in Figure 13 (rectangular block 210 of Fig. 1 is regarded the steel plate of magnetic flux biasing usefulness as here), be offset to than its steel plate (210) of the magnetic flux biasing usefulness in the place ahead more by the magnetic flux in the place ahead of weld seam.

As shown in Figure 1, here in the present embodiment, cross groove with magnetic circuit member 210 and make magnetic flux constitute bypass.

Figure 10 amplifies expression magnetic circuit member 210, and Figure 11 represents the section of 11A-11A line among Figure 10.With reference to these accompanying drawings.The lower end of aforesaid slide bar 208 is fixed on magnetic (steel plate materials) support 211.As shown in Figure 3, support 211 is 45 degree " ュ " font shape of cross sections that tilt, and inserts the polylith silicon steel plate 216 of the thickness 0.5mm of a plurality of silicon steel plate 217a～217d of the thickness 0.5mm that leg uses and Zhi Ganyong at the interior space segment of this " コ " word.As shown in figure 11, silicon steel plate 217a～217d that pin is used is in order to contact with goods WR, WL, and long on the directions that becoming 45 degree with the Z axle, the silicon steel plate 216 that the cadre uses is shorter, and each sheet (a slice) is inserted between each sheet of silicon steel plate 217a～217d that pin uses.The lower surface of silicon steel plate 217a～217d that pin is used becomes the inclined plane of 45 degree, so that the contact area of increase and goods.

As shown in figure 10, silicon steel plate 217a～217d that pin is used width on the Y direction is short and become 4 groups, but these 4 groups of total width of the length of the silicon steel plate 216 that the cadre uses.Support the silicon steel plate that whole pin are used and the cadre uses with bolt 213a～213d with the extension form of hanging.Packing ring 212a～the 212d, support 211, pin that cuts into the cover tubular that 45 degree tilt by going to the bottom with and the silicon steel plate used of cadre and will going to the bottom cut into the packing ring 214a～214d of the cover tubular that 45 degree tilt, utilize the nut 215a～215d of the threaded engagement of fastening and these bolt ends, 213a～213d is fixed on the support 211 with these bolts.

The aperture of the silicon steel plate that bolt passes through is bigger than the diameter of bolt, the silicon steel plate that pin is used fully each sheet on the Z direction can about, and can tilt and bending/elongation at directions X.Because of the aperture of guide sleeve 207 bigger than the external diameter of slide bar 208, so slide bar 208 can carry out banking motion for guide sleeve 207.

Figure 12 represents 12A-12A line cutaway view among Figure 11.As shown in figure 12, when the deviation of Z direction is arranged between goods WR, WL (level differs), silicon steel plate 217a, the 217b that the 1st and the 2nd group pin is used touch goods WR above, silicon steel plate 217c, the 217d that the 3rd and the 4th group pin is used touch goods WL above.Slide bar 208 tilts with respect to sleeve 207, makes that to become above-mentioned contact such.In addition, as shown in figure 12, when other object (for example cut welding wire) 218 is arranged on goods WR, the silicon steel plate that pin is used tilts to cross this other object, the silicon steel plate that whole pin are used moves up and down frequently, and tilting to move or center on the bolt rotation at directions X makes their lower end contact goods to greatest extent.

Therefore, cross groove α towards the flux concentrating of goods WR to the silicon steel plate 217a that uses through the 1st and the 2nd group pin, the magnetic circuit of the pin of silicon steel plate 216 that 217b/ cadre uses and the 3rd and the 4th group the silicon steel plate 217c, the 217d that use from goods WL, as shown in figure 13, by the place ahead of the welding direction X of the weld seam 9f of welding torch Tf in advance, want to cross the magnetic flux of groove α, just circuitously flow to than it more in the magnetic circuit member 210 in the place ahead to WR from goods WL.Its result, the magnetic flux of the groove part in the welding is reduced near the solid line shown in Figure 14 (a) or its front and back, thus, can make that welding torch Tf dies down in the unsettled electromagnetic force of the welding arc at welding torch rear in advance, the wavy gravy on welding bead surface reduces, the generating capacity that splashes reduces sharp, can obtain the little root of amplitude variation.

The magnetic flux of silicon steel plate 217a～217d that utilization is used by pin, these silicon steel plates are adsorbed on goods WR, the WL, silicon steel plate 217a～the 217d that uses because of pin forwards direction tilts, and therefore being used to revolt absorption affinity, to drive the force rate of magnetic circuit member 210 on directions X less.The lower surface of the silicon steel plate 217a～217d that uses because of leg becomes the inclined planes of 45 degree, thus big with the contact area of workpiece, make magnetic flux travel back across effective in the magnetic circuit member 210.

Figure 15 represents to be used for to replace the outward appearance of magnetic circuit member 220 of the 2nd example of the magnetic circuit member 210 of aforesaid the 1st example.State with identical with aforesaid magnetic circuit member 210 is installed in this magnetic circuit member 220 on the chassis shown in Figure 11.Magnetic circuit member 220 shown in Figure 15, the width of Y direction be the length of 200mm, groove extending direction be 120mm, thickness be the center of steel plate 223 of magnetic flux biasing usefulness of 22mm by the fixing shell 222 of ball-joint of screw thread, slide bar 208 is fixed on the interior spheroid 221 of this ball adapter.Other structure and Fig. 1, the 1st example shown in Figure 10 are identical.

The magnetic circuit member 220 of this 2nd example can be with respect to arm 206 lifting on the Z direction, and can be with respect to slide bar 208 at directions X and Y direction banking motion, so the magnetic circuit member often is in goods WR, WL and their contact area becomes maximum posture.Therefore, any magnetic flux shunts of magnetic circuit member is effective.In the 2nd example, near the place ahead of the welding direction X of the weld seam 9f of welding torch Tf in advance, want to cross the magnetic flux to WR with groove α from goods WL, circuitously flow to than it more in the magnetic circuit member 220 in the place ahead.Its result, the magnetic flux of the groove part in the welding is reduced near the solid line shown in Figure 14 (a) or its front and back, thus, making in advance, welding torch Tf dies down in the unsettled electromagnetic force of the welding arc at welding torch rear, the wavy gravy on welding bead surface reduces, the generating capacity that splashes reduces sharp, can obtain the little interior ripple of amplitude variation.Magnetic circuit member 220 simple structures of this 2nd example and firmly, and check and cleaning simple.

Figure 16 represents to be used for to replace the outward appearance of magnetic circuit member 230 of the 3rd example of the magnetic circuit member 210 of aforesaid the 1st example.State with identical with aforesaid magnetic circuit member 210 is installed in this magnetic circuit member 230 on the chassis shown in Figure 11.Magnetic circuit member 230 shown in Figure 16, on magnetic (steel) pedestal 223 in interior space with downward direction opening, upwardly extending magnetic (steel) roll shaft 224a～224e is distributed on the directions X in Y side with 6, and rotation installs freely, the side of magnetic roll shaft 224a～224e below than outstanding 0.5mm below the pedestal 223 about.That is to say that magnetic roll shaft 224a～224e leaves about goods WR, WL0.5mm pedestal 223.By means of using roll shaft, the magnetic adsorbability of balanced action on magnetic circuit member 230 reduces the power that drives magnetic circuit member 230 on directions X sharp.But because of roll shaft is the line contact with respect to goods WR, WL, so magnetic resistance is big, so adopt many roll shafts to make the magnetic circuit resistance decreasing.In order to utilize pedestal 223 also can make most any magnetic flux shunts, adopt thick-walled structure in addition, reduce simultaneously as far as possible with the spacing of goods WR, WL to the 0.5mm.

Identical with the 2nd example, with ball adapter (221,222) pedestal 223 is connected with slide bar 208.Other structure is identical with the 1st example shown in Figure 1.In the 3rd example, near the place ahead of the welding direction X of the weld seam 9f of welding torch Tf in advance, want to cross the magnetic flux of groove α to WR from goods WL, circuitously flow to than it more in the magnetic circuit member 230 in the place ahead.Its result, the magnetic flux of the groove part in the welding has high slightly value than the solid line shown in Figure 14 (a), there is not the occasion of magnetic circuit member 230 to reduce sharp, thus, making in advance, welding torch Tf dies down in the unsettled electromagnetic force of the welding arc at welding torch rear, the wavy gravy on welding bead surface reduces, and the generating capacity that splashes reduces sharp, can obtain the little interior ripple of amplitude variation.

Figure 17 represents the outward appearance of the magnetic circuit member 240 of the 4th example.State with identical with the magnetic circuit member 210 of aforesaid the 1st example is installed in this magnetic circuit member 240 on the chassis shown in Figure 11.Magnetic circuit member 240 shown in Figure 17, to and come on the directions X and pass than this aperture in the thicker hole of the diameter of those upper process portions and want thin pivot pin 243 at the steel plate 242a～242d of the convex that the Y direction is extended, stitch 243 be fixed on the support 241 of " コ " font that 45 degree tilt on the directions X.Not shown compression screw thread spring is inserted between adjacent steel plate 242a～242d as partition, and stitch 243 passes these springs.

The lower end of slide bar 208 is fixed on the support 241.The lower surface of steel plate 242a～242d becomes the inclined planes of 45 degree, when these steel plates 242a～242d with respect to goods WR, when the WL45 degree tilts, the lower surface of steel plate closely be attached to goods WR, WL above.Aperture by means of steel plate 242a～242d is much bigger than the external diameter of stitch 243, and because of between adjacent steel plate 242a～242d, the collapse coil spring being arranged, and separating between the steel plate on the directions X, so steel plate 242a～242d can distinguish individually for the directions X banking motion, and can on the Z direction, shake for stitch 243, stitch can rotate around 243 simultaneously.Therefore, steel plate 242a～242d can become the posture of maximum contact area with respect to goods WR, WL.

Other structure is identical with the 1st example shown in Figure 1.In the 4th example, near the place ahead of the welding direction X of the weld seam 9f of welding torch Tf in advance, want to cross the magnetic flux of groove α to WR from goods WL, circuitously flow to than it more among the steel plate 242a～242d of the magnetic circuit member 240 in the place ahead.Its result, the magnetic flux of the groove part in the welding is lower slightly than the value of the solid line shown in Figure 14 (a), there is not the occasion of magnetic circuit member 240 to reduce sharp, thus, making in advance, welding torch Tf dies down in the unsettled electromagnetic force of the welding arc at welding torch rear, the wavy gravy on welding bead surface reduces, and the generating capacity that splashes reduces sharp, can obtain the little interior ripple of amplitude variation.Magnetic circuit member 240 simple structures of this 4th example and firmly, and safeguard and cleaning simple.

C. fill metal feedway 400:

Figure 18 amplifies the key component that metal feedway 300 is filled in expression.The support 312 of " コ " font is fixed on the front end of arm 306, and support 312 is bearing in upwardly extending guide rod 312a in Y side and the screw mandrel 313 that extends in parallel.Screw mandrel 313 can rotate freely with respect to support 312, and the one distal process goes out on the lateral surface of support 312, and knob is fixed on the outstanding front end.With slide block 314 by being threadably engaged on the screw mandrel 313.Guide bar 312a passes logical slide block 314 and can be free to slide, and guide shoe 314.When the knob that rotates screw mandrel 313 by hand, when making screw mandrel 313 with respect to slide block 314 rotation, the slide block 314 of method guide bar 312a guiding in horizontal plane along with respect to the vertical direction Y of chassis travel direction X, be that the width of groove α moves.

Having the circular hole that on above-below direction Z, connects on the slide block 314.In this circular hole, be pressed into the lower end of cut welding wire service 316, and be pressed into the upper end of the front end nozzle 317 of nonmagnetic material.The upper end of pipeline 316 is connected with the cut welding wire loading hopper 315 that is roughly funnel type, utilizes gravity that the cut welding wire cw in the loading hopper 315 is run down in the pipeline 316.The last end bearing loading hopper 315 of supporting arm 311.

On the slide block 314 with the side of Y direction arrow opposition side on, the rotating shaft 319a that extends at the vertical direction X with respect to the moving direction Y of slide block 314 is that centre bearing becomes to be roughly the arm 319 of " ㄑ " font by plate bending and can rotate freely.On the side lower end, with respect to front end nozzle 317 of arm 319, fixed bearing vertical outstanding columniform magnet 318, so that make the outer surface of front end near front end nozzle 317.Having on the front end nozzle 317 under the state of cut welding wire cw, be rotated counterclockwise the arm 319 among Figure 18, when magnet 318 arrives predetermined distances near front end nozzle 317, utilize attraction for cut welding wire cw, the front end of magnet 318 is attracted on front end nozzle 317.At this moment, shown in solid line among Figure 18, almost vertical with the lower part from the rotating shaft 319a of arm 319 is from tilting slightly with top of the rotating shaft 319a of arm 319.Utilize the attraction of magnet 318, the cut welding wire cw of front end nozzle 317 rests on the inside of front end nozzle 317, is not released to outside (closing).

The baffle plate 320 that is roughly hook is outstanding below slide block 314.At first, baffle plate 320 extends on the direction opposite with direction arrow Y from being fixed on base portion on the slide block 314 towards the side of the supporting arm 319 of slide block 314, and then the bending front end, so that relative with the back side (back side of the side of supporting magnet 318) of arm 319.The tilt side of the baffle plate 320 relative with the back side of arm 319 is inclined, and is consistent with the inclination at the back side of the arm 319 that causes because of rotation.When in Fig. 2 during to the upper end of the direction turning arm 319 of " the opening " shown in the double dot dash line, arm 319 just with rotating shaft 319a be the center in Figure 18 along turning clockwise, and the front end of magnet 318 separates from front end nozzle 317.When the front end of magnet 318 from front end nozzle 317 leave regulation apart from the time, utilize attraction for the magnet 318 of baffle plate 320, magnet 318 is attracted to baffle plate 320, and the lower end of arm 319 remains on the position of " opening " of representing with 2 pecked lines among Figure 18.In this state, inoperative for the magnetic flux of front end nozzle 317 magnet 318.Therefore, the cut welding wire cw in the front end nozzle 317 flows out to the outside from the opening of front end nozzle 317 uncommittedly.

Because of the flowability of cut welding wire cw poor, so front end nozzle 317 1 stops, cut welding wire cw just flows down from front end nozzle 317, stream under groove in, reach the lower end of front end nozzle 317 or during than its high slightly horizontal plane, cut welding wire cw just stops to flow out from front end nozzle 317 when its horizontal plane.When front end nozzle 317 when groove moves, because of the upstream side on its travel direction still is empty, so cut welding wire cw flows down there, cut welding wire cw is distributed in the groove automatically, use the height with respect to the front end nozzle 317 of groove bottom to determine its horizontal plane.

Arm 306 is the parts with the not shown connecting elements of connecting elements (201～206) same structure of supporting magnetic circuit member 210, by means of this connecting elements is fixed on the support rod 13, as shown in Figure 2, filling metal feedway 300 is installed on the chassis 1.By means of the height that utilizes connecting elements, adjusting device 300, adjust the distributed depth of cut welding wire cw.

D. guide rail 400 and chassis driving mechanism 500:

Figure 30 represents the outward appearance of guide rail 400 in the past.By support foot 31L, 31R, the guide rail in the past 403 that guiding is welded chassis is fixed on the supporting bracket 405.Below supporting bracket 405, fixing permanent magnet 52L, 52R.In addition,, also have lever (Figure 20 408), omit among the figure in order to be used for permanent magnet being broken away from from the steel plate WR of welding object.

Aforesaid guide rail 403 in the past is flexible poor, is difficult to bending, bad adaptability in the groove welding of epirelief or the spill steel plate that upwarps.Because of guide rail 403 is long sizes, though so can be crooked slightly, but when the curved surface of the spill steel plate of for example forcing the epirelief below radius of curvature is counted 10m or upwarping, the power that is applied on the guide rail 1 surpasses elastic limit (yield point), guide rail 403 permanent deformations or damage.Therefore, the bending guide rail that the bending that in the past must utilize bending machining to make (special customization) and steel plate in advance matches improves the welding cost of curved plates.Guide rail 400 shown in Figure 1 has improved aforesaid problem.

Figure 20 represents the outward appearance of guide rail shown in Figure 1 400, and Figure 21 represents the end face of guide rail shown in Figure 20 400.On the directions X that guide rail 403 (guide rail component 32R, 32L, connecting plate 404, tooth bar 402) extends every fixed range (being 500mm in the present embodiment) permanent magnet 52L, 52R side by side, be adsorbed on steel plate (goods) WR of welding object, thus, supporting bracket 405 is fixed on the goods WR.

Supporting bracket 405 for be parallel to the surface of goods WR, in Y side upwardly extending rectangular tabular support, in its surface, upright columned guide rail pin 31L, 31R (Figure 21), these pin are from following support rails member 32R, 32L.The reverse side of supporting bracket 405 is surperficial relative with goods WR's.Be adsorbed on the surface of goods WR as permanent magnet 52L, the 52R of the pin of supporting bracket 405, and supporting support 405 abreast with respect to goods WR.

Separating mechanism 408 is installed on supporting bracket 405.By means of the handle 484 of the front end of mentioning separating mechanism 4Q8, lever 483 is that the center is rotated with rotating shaft 482.Be accompanied by the rotation of lever 483, the corner connection of the root of the lever 483 relative with goods WR surface contacts the surface of goods WR.The angle of the base portion of lever 483 is processed into circular-arc, exert pressure with respect to the surface of workpiece WR in the angle of lever 483 roots, utilization is the lever principle of fulcrum with rotating shaft 482, the following arm 481 that is vertically installed in supporting bracket 405 has been produced big top lift, permanent magnet 52L, 52R have been broken away from from the surface of goods WR.When further make progress when playing lever 483, guide rail 400 counterclockwise rotates for middle mind-set with the following left comer (Figure 21) of the permanent magnet 52L of left and lays across, weaken for the permanent magnet 52L of goods WR, the attraction of 52R, the operator can easily mention guide rail 400.

2 guide rail component 32L, 32R that supporting roller is used extend on directions X with the state that is parallel to each other, and constitute guide rail 403, are fixed on guide rail pin 31L, 31R difference support rails member 32L, 32R above them.And, be parallel to goods WR, be installed between guide rail component 32L, the 32R, and connect guide rail component 32L, 32R at the connecting plate 404 that extends on the directions X.Center at the width on connecting plate 404 surfaces is installed with the tooth bar 402 that extends on directions X.

Figure 22 is illustrated near the vertical cross-section (the 22A-22A line section of Figure 20) of the guide rail 403 of the position of leaving near the fixing point 150mm of starting point the 1st slotted hole 4L2,4R2, and Figure 23 represents vertical vertical disconnected cut open (the 23A-23A line section of Figure 20) of the guide rail 403 of the 1st slotted hole 4L2,4R2 and the position of the 2nd slotted hole 4L3,4R3.

On the connecting plate 404 near its starting point (end face on right side shown in Figure 20), have circular hole 4L1,4R1 (Figure 21) that stop screw passes through, screw among female threaded hole 3L1, the 3R1 (Figure 21) of guide rail component 32L, 32R by this circular hole, stop screw 6L1,6R1, thus, connecting plate 404 is fixed on guide rail component 32L, the 32R.That is to say that connecting plate 404 is being fixed near the starting point on guide rail component 32L, the 32R, make it all can not relative motion on any direction of X, Y.

From this fixing point on directions X every certain distance (being 150mm in the present embodiment), on the symmetric position on the width central authorities both sides that tooth bar 402 is installed, be useful on and pass stop screw, the slotted hole 4L2 that on directions X, grows, 4R2,4L3,4R3 ... (Figure 20, Figure 22, Figure 23), at guide rail component 32L, the lip-deep position with respect to these slotted holes of 32R has the female threaded hole 3L1 that stop screw is installed, 3R1 (Figure 22, Figure 23), by the slotted hole 4L2 of connecting plate 404,4R2,4L3,4R3 ... stop screw 6L2,6R2,6L3,6R3 ..., revolve the people to guide rail component 32L, the cap nut hole 3L2 of 32R, among the 3R2.For fear of because stop screw 6L2,6R2,6L3,6R3 ... 404 pressurizations tighten up (sliding relatively with connecting plate in order to make stop screw) to connecting plate, and with sleeve pipe (collar) 7L1, the tube of 7R1 is done and inserted people's slotted hole 4L2, among the 4R2, stop screw 6L2,6R2 pass this sleeve pipe 7L1,7R1.

Sleeve pipe 7L1,7R1 have the flange that connects with the tube involvement on its dried upper end, the length that tube is done (lower end that tube is done and the distance of ring flange lower surface) is more a little longer than the thickness of slab of connecting plate 404.Thus, with stop screw 6L2, among 6R2 DRIVE SCREWS cap hole 3L2, the 3R2, up to clamp sleeve 7L1, till the 7R1, though, stop screw and sleeve pipe and guide rail component 32L, 32R overall fixed, connecting plate 404 can slide on the Y direction for sleeve pipe.The slotted hole 4L2 of connecting plate 404,4R2,4L3,4R3 ... though the external diameter that the tube of the sleeve 7L1, the 7R1 that pass at the width and the stop screw of directions X is done is roughly the same, but the width of Y direction (length) is bigger than the external diameter of this sleeve, has long seam shape on the Y direction of the extension of connecting plate 404.

In near the width central authorities the starting point (end face on right side shown in Figure 20) of connecting plate 404, have the circular hole 4c1 that stop screw passes through, stop screw 6c1 is revolved among the cap nut hole 3c1 of people's magnetic stripe 402 by this circular hole 4c1, thus, magnetic stripe 402 is fixed on the connecting plate 404.That is to say, magnetic stripe 402 is being fixed near the starting point on the connecting plate 404, make its any direction all motionless with respect to X, Y.

From this fixing point on directions X every certain distance (being 150mm in the present embodiment) with aforesaid slotted hole 4L2,4R2,4L3,4R3 ... on position roughly the same on the directions X, be useful on and pass slotted hole 4c2, the 4c3 that magnetic stripe is installed stop screw 6c2, the 6c3 of usefulness from the negative ... (Figure 22, Figure 23), on the reverse side of magnetic stripe 402 with respect to these slotted holes 4c2,4c3 ... the position on have stop screw 6c2,6c3 be installed ... cap nut hole 3c2,3c3.

By the slotted hole 4c2 of connecting plate 404,4c3 ... stop screw 6c2,6c3 ..., revolve the people in cap nut hole 3c2, the 3c3 of magnetic stripe 402.For fear of because stop screw 6c2,404 pressurizations tighten up (sliding relatively with connecting plate in order to make stop screw) to 6c3 to connecting plate, and with sleeve pipe 7c1, the tube of 7c2 is done and inserted slotted hole 4c2, and among the 4c3, stop screw 6c2,6c3 pass this sleeve pipe 7c1,7c2.

The external diameter that the tube of sleeve 7c1,7c2 that the slotted hole of connecting plate 404 passes at the width and the stop screw of Y direction is done is roughly the same, but the width of directions X (length) is bigger than the external diameter of this sleeve, has long seam shape on the directions X of the extension of connecting plate 404.

When with the above guide rail 400 that has illustrated, in epirelief or when upwarping on the bigger goods WR of the bend ratio of spill with respect to the parallel installation of its groove, permanent magnet 31L, 31R are adsorbed on the goods WR, and guide rail component 32L, 32R are parallel with the upper surface of goods WR.That is to say, crooked in the same manner with the bending of goods WR.At this moment, because of the starting point (at Figure 20 right-hand member) of guide rail 403 fixed connecting plate 404 on guide rail component 32L, the 32R and on connecting plate 404 fixing magnetic stripe 402, so this is fixed on the goods WR.But, on other a plurality of points of directions X, because of connecting plate 404 can slide on directions X for guide rail component 32L, 32R, in addition, magnetic stripe 402 can slide on directions X for connecting plate 404, and because of 3 bendings individually respectively, thus easy bending and elastic limit (yield point) height, and each self energy is along curved surface (goods WR) bending of little radius of curvature.That is to say, because 3 separately distance (z) differences for curved surface (goods WR), therefore 3 separately radius of curvature differences, though guide rail component 32L, 32R, connecting plate 404, when four parts such as magnetic stripe 402 and goods WR project on the horizontal plane, different relatively with corresponding four parts of the specific length on horizontal plane physical length separately, but because of this difference is relatively slided on directions X, so at guide rail component 32L, between 32R and the connecting plate 404, between connecting plate 404 and the magnetic stripe 402, do not produce the stress of directions X, guide rail component 32L, 32R, connecting plate 404 and magnetic stripe 402 3 parts are crooked easily, are difficult to produce plastic deformation and damage (fractures, crackle).Therefore, guide rail 400 not only all has very high adaptability for the plane but also for the curved surface of various curvature.

Cause is in the total length of whole directions X, on width Y, connecting plate 404 is clamped on guide rail component 32L, the 32R, magnetic stripe is clamped on the connecting plate 404, so guide rail 403 is in the total length of whole directions X, because of width certain, the width position of magnetic stripe 402 is certain, so can guarantee the linearity of the directions X of guide rail component 32L, 32R and magnetic stripe 402.

In addition, in aforesaid example, the tube of sleeve is done slotting people in slotted hole, and in sleeve, pass stop screw, but also can omit sleeve, length is than a little longer having than the thick cylindrical ladder screw of diameter as stop screw of the thickness of slab of connecting plate 404 between employing ridge top and the screw terminal.

Figure 24 represents the chassis driving mechanism 500 on the chassis 1.The left and right side of aforesaid guide rail 403 is the chevron of the inclined plane formation of 45 degree for the horizontal plane with respect to guide rail 403, left surface profiling roller r1, the r2 of chassis 1 contact with the inclined plane of left surface, right flank profiling roller r3, the r4 of chassis 1 contact with the inclined plane of right flank, and chassis 1 usefulness left surface profiling roller r1, r2 and right flank profiling roller r3, r4 clamp guide rail 1.Left surface profiling roller r1, r2 and right flank profiling roller r3, r4 support with roller head 506a and 506b respectively, and can rotate freely.Roller head 506b is bearing on the chassis 1, and can rotate freely, but also can utilize stop screw 507 not make its rotation.The front end of screw mandrel 505a links to each other with roller head 506a, and can rotate freely, and the female threaded hole of screw mandrel 505a and chassis 1 matches to merge and passes this cap nut hole.Fixed knob 505 on the rear end of screw mandrel 505a.By means of the knob 505 that turns clockwise, revolve people's screw mandrel 505a, left surface profiling roller r1, r2 and right flank profiling roller r3, r4 are strengthened the clamping pressure of guide rail 403.By means of inhour rotation knob 505, clamping pressure is weakened.

The pinion 504 of chassis 1 intermeshes with the tooth bar 402 of guide rail 403, chassis 1 by with motor output shaft form one gear 501 and with the cog belt 502 of its engagement, the rotation of motor 500m is sent to travelling gear 503.Travelling gear 503 is fixed on the rotating shaft 503a, and on this rotating shaft 503a fixing pinion 504.Therefore,, just rotate driving pinion 504 and pusher tooth bar 502, so chassis 1 is (mobile on Figure 24 direction vertical with paper in direction that guide rail 403 extends when motor 500m one rotation.

E. the welding condition given disc 30:

Figure 31 represents the example of control panel welder in the past, the action of control welding mechanism of single face of the docking section of groove profiling welding 2 sheet material WR, WL.In addition, only provided correspond respectively to the welding object material, with the relevant part of input and output of the welding condition of adjustment or appointment, omitted adjustment, setting or the relevant part of indication among the figure with other.In embodiment in the past shown in Figure 31, setting or changing on the operation panel 36A of the designated value that supplies to various controllers in the control panel 30A, rotary switch (thickness of slab selector switch 38A) is arranged, by the digital switch that has display lamp (setting value alternation switch a1, a2, display setting project selector switch a3～digital switch group 37A that a9) forms and the set value display 39A that shows the value of being set.IOC 41A (comprising input interface) reads in the data with these switch inputs.IOC 41A calculates the command value of various controller Cm, Cor, Cot and each source of welding current Ppf, Ppb in the control panel 30A according to the data of reading in, and by output interface 41B, the command value data is outputed in the various controllers.D/A converter 31A that the command value data is transformed into command voltage (dummy instruction signal) etc. is arranged in output interface 41B, command voltage is supplied in the various controllers.

Reference is to 7 kinds of thickness of slab values (the various typical values of 7 kinds of thicknesss of slab) 9mm, 12mm, 14mm, 16mm, 19mm, each of 22mm and 25mm has write the welding condition table of welding condition data, the operator at first rotates the thickness of slab selector switch and sets thickness of slab before the welding beginning, and is consistent with desired thickness of slab, then, select to set welding torch or back row welding torch in advance by means of welding torch switch a3 in advance that presses display setting project selector switch or back row welding torch switch a4.Take out and the value of the project that input will be set (welding current value, welding voltage value, shake width value, shake velocity amplitude (inferior/minute), speed of welding value) from welding torch condition table then.At this moment, at first use setting item selector switch a5～a9, specify the project (welding current, weldingvoltage, shake width, shake speed, speed of welding) of welding condition.And on one side confirm the setting value that in set value display 39A, is shown with eye, utilize and press setting value alternation switch a1 (increases), a2 (minimizing) on one side, make show value become the value that hope is imported.IOC 41A in appointed welding condition corresponding items output latch, writes the show value that has changed behind each variation show value.Output latch is 8 latch, parallel output 8 bit data.The D/A converter is the converter of parallel input, classification produce the value represented with 8 bit data corresponding voltage (command voltage is a command signal), and supply in the controller.

At the aforesaid storage pre-setting method of welding operation field by using, operate a lot of switches and bother very much.In addition, setting welding condition as previously mentioned, after not shown welding firing switch being operated and begun welding, needing sometimes to judge welded condition, and adjusting or the change welding condition with eye.Though the adjustment of the welding condition in the welding is also carried out with aforesaid switching manipulation, but must carry out switching manipulation repeatedly as previously mentioned, up to decision (change) setting value, because of setting item (adjustment project) so when adjusting operating cost, simultaneously easily produce mistake in the increase and decrease direction of the appointment of the project of adjustment and data value is specified, operator's burden is big.And, IOC 41A as shown in figure 31 and the combination of output interface 41B, huge because of number of data lines (parallel figure place), the circuit elements number of packages is also many, circuit is complicated, so device price height.

Here, in the welder of present embodiment, do welding condition given disc 30 to such an extent that can be connected or break away from control circuit 20.

Figure 25 represents the outward appearance of welding condition given disc 30 shown in Figure 1, and Figure 26 represents the connection status of welding condition given disc 30 and each power supply, controller and mechanism.Comprise that in given disc 30 rotation that utilizes knob (31a) changes the variable resistance 31～35 of resistance value, 37～40, when the connector 36 with given disc 30 is inserted among the terminal board 20a of control panel 20, just these variable resistances 31～35,37～40 are connected in each power supply and the controller.By the knob (31a) that rotates these variable resistances, the command value (level of command signal) that supplies to each power supply and controller is changed.

In given disc 30, has the variable resistance 31,32,37,38 of specifying welding current and weldingvoltage for each welding torch of going ahead of the rest, go in the back respectively, the variable resistance 33,34,39,40 of width that appointment is shaken and number of times (inferior/minute), and the variable resistance 35 of rotary speed (speed of welding) of specifying the drive motors 500m of chassis 1.

Variable resistance 31 has rotary-type moving part, and on connected rotating shaft, has fixed the knob 31a that has arrow that rotary locking mechanism is housed, and spin locking button 31b is outstanding from knob 31a with releasing button 31c.That is to say, be the variable resistance that has the dial type of locking mechanism.

When pressing disengage button 31c, the outstanding position in the above of spin locking button 31b, knob 31a can rotate.The operator is by means of clockwise direction or counterclockwise rotate knob 31a, make its arrow be in the position of the current value of wanting on the scale plate 31d of dull and stereotyped ring-type, just can specify the welding current indicated value.When finish specifying, press locking press button 31b, till the chucking position.Like this, knob 31a can not rotate.Other variable resistance is also identical with 31 structure, only scale plate 31d difference.

For example, with regard to the welding torch Tf that goes ahead of the rest, welding torch Tf is connected on the source of welding current Ppf in advance, the connector 36a (Figure 26) of the connector 20a of the signal receiver side by control circuit 20 and the signal outlet side of given disc 30, source of welding current Ppf are connected to welding current and regulate the variable resistance 31 and the weldingvoltage of usefulness and regulate on the variable resistance 32 of usefulness.By means of rotation knob 31a, the resistance change of variable resistance 31, source of welding current Ppf controls the welding wire feed speed, makes the welding current value of welding torch Tf consistent with the value shown in the target current value signal.Equally, by means of the knob of rotary variable resistor device 32, the resistance change of variable resistance 32, source of welding current Ppf controls output voltage, makes the weldingvoltage of welding torch Tf consistent with the value shown in the target voltage value signal.

In addition, by the connector 20a of signal receiver side and the connector 30 of signal outlet side, control in advance shaking of welding torch head motion 6f connect shaking the variable resistance 33 that width adjusting uses and shaking the variable resistance 34 that number of times is regulated usefulness of given disc 30 on the controller Cof.By means of the knob of rotary variable resistor device 33, the resistance change of variable resistance 33 supplies to the voltage (shaking width signal) that shakes controller Cof from variable resistance 33 and changes.This voltage is that target is shaken width signal, shakes controller Cof control head motion 6f, and making shake width and the target of welding torch Tf, to shake the value shown in the width signal consistent.In the same manner, by means of the knob of rotary variable resistor device 34, the resistance change of variable resistance 34 supplies to the voltage (shaking the number of times signal) that shakes controller Cof from variable resistance 34 and changes.This voltage is that target is shaken the number of times signal, shakes controller Cof control head motion 6f, and making shake number of times (inferior/minute) and the target of welding torch Tf, to shake the value shown in the number of times signal consistent.

Specify the welding current desired value of back row welding torch Tb with variable resistance 37, specify the weldingvoltage desired value of back row welding torch Tb with variable resistance 38, specify the target of back row welding torch Tb to shake width with variable resistance 39, specify the target of back row welding torch Tb to shake number of times with variable resistance 40.

By the motor driver of chassis 1, the chassis controller Cm of control circuit 20 carries out the forward and backward driving to the chassis drive motors 500m of chassis 1.Variable resistance 35 is supplied with chassis controller Cm with target speed signal.By means of the knob of rotary variable resistor device 35, the resistance change of variable resistance 35, the voltage (target speed signal) that supplies among the chassis controller Cm changes.When chassis controller Cm (direction of travel during welding :+when x) driving forwards chassis 1, the rotary speed of control chassis drive motors 500m makes the speed of travel of chassis 1 consistent with the speed shown in the target speed signal.The speed of travel of returning is a fixed value.

(the Y direction Breadth Maximum of groove) or bevel angle and steel plate thickness etc. are different at interval because of the opening of groove α for the welding condition of setting with each variable resistance.For example, shown in Figure 19 (a), in the little at interval occasion of the opening of groove α, it is less to set welding current, and adjusts weldingvoltage corresponding to the welding situation.And, set less width and the less number of times that shakes of shaking.On the other hand, shown in Figure 19 (b), in the big at interval occasion of the opening of groove α, it is bigger to set welding current, and adjusts weldingvoltage corresponding to the welding situation.And, set bigger width and the more number of times that shakes of shaking.In Figure 19, BP is a backing material.It shown in the table 1 below the example of the welding condition of different thicknesss of slab.

[table 1]

Thickness of slab	Speed	Welding torch Tr goes ahead of the rest		Back row welding torch Tt		Welding torch shakes in advance		Back row welding torch shakes
										mm	cm/min	Electric current A	Voltage V	Electric current A	Voltage V	Width of cloth mm	Inferior several/min	Width of cloth mm	Inferior several/min
9	60	480	41	430	42	4	200	4	100
										12	45	500	43	450	42	5	175	5	100
16	40	540	43	480	43	5	175	6	80
										19	30	540	43	500	43	6	140	8	60
22	23	550	43	520	44	6	110	8	60

If prepared the welding condition given disc 30 of setting each variable resistance according to different thicknesss of slab in advance for every kind of thickness of slab, the corresponding given disc 30 of thickness of slab that then needs to select and disposed goods WR, the WL of welder is changed to be installed on the welder and is got final product, because of not needing to be rotated the operation that each variable resistance is set each the welding condition value corresponding with thickness of slab at the welding scene, so it is simple to operate, without difficulty, and can shorten the operating time, so operating efficiency is good and match with the situation of operation site.

Other places are compared with the input that utilizes digital switch, the variation of numerical value is easy, while think the occasion of change setting for being eager in the welding and with confirming that it is effective that the welding situation is set the occasion of change.

F. utilize the bipolar electrode single face gas shield welding of aforesaid welder:

Then, to illustrated shown in as described above, with reference to figure～Figure 26, use the bipolar electrode single face gas shielded arc welding to be hinged with the welding method of putting to describe.

The groove that goods WR, WL form is the V or Y (Fig. 5) shape of 30～55 ° of bevel angles, for the groove skew does not take place in welding, preferably utilizes the location welding that the groove inner face is positioned weldering.Reverse side at groove has backing plate BP; as shown in Figure 2; in groove α, steel grit or iron powder are distributed in the height below 2/3 more than 1/4 of thickness of slab; and making in advance welding electrode silk 9f (welding torch Tf) carry out that the back row welding electrode silk 9b (welding torch Tb) that shakes, makes below 150 times/minute carries out shaking below 120 times/minute more than 30 times/minute more than 40 times/minute, this shaking carried out once promptly a unit and promptly finished once and move back and forth.

Welding current density by means of the welding electrode silk 9f that goes ahead of the rest is with respect to welding wire sectional area 230A/mm ²More than, the welding current density of back row welding electrode welding wire 9b is with respect to welding wire sectional area 150A/mm ²More than; anode-cathode distance Dw with back row welding electrode welding wire 9f, 9b is below the above 600mm of 100mm in advance; carry out bipolar electrode single face gas shielded arc welding and connect, can finish arc stability, cracking resistance good, surface of good and back bead, and welding efficiently arranged.

In addition, as shown in Figure 7, anode-cathode distance Dw is the distance along the welding electrode welding wire 9f in advance of the groove of goods and back row welding electrode welding wire 9b.

Fig. 9 represents the steel grit distribution height and the back side that the bipolar electrode single face gas shielded arc welding of multiple thickness of slab connects, the relation of the shape of welding bead.Table 2 is depicted as all conditions of welding at this moment.When experimentizing, corresponding to each thickness of slab, change electric current, shake width (vibration width), shake number of times (vibration number: inferior/minute)." root gap " of table 2 is meant the beeline between the groove cross section, relative work WR, WL.In Fig. 5, provided root gap.

[table 2]

In addition, the round label on Fig. 9, triangle label and * label is represented measuring point, and circular label represents that the back bead shape is good, weld bead shape was bad in the triangle label was represented, weld bead shape is very poor or burn in * number the expression.

As shown in Figure 9, by means of steel grit or iron powder being distributed in the height below 2/3 more than 1/4 of thickness of slab in the groove of each thickness of slab and being welded, the shape of interior welding bead is good.When distribution height surpass thickness of slab 2/3 the time, interior weld bead shape is very poor, maybe can not form interior welding bead, less than 1/4 o'clock, then burns.

In addition, the size distribution of steel grit or iron powder is preferably in below the particle diameter 1.5mm, because the shape of arc stability, interior welding bead is good like this.In addition, composition mainly is made up of Fe, but from cracking resistance, C is below 0.10%, and S and P are being good below 0.020, and other composition is considered the strength and toughness of weld metal, also can contain Si, Mn, Mo and other deoxidant and alloying constituent.If satisfy above granularity and composition, then also the steel welding wire of various sizes can be made the coccoid of cutting.

Bevel angle is less than 30 °, and the uniformity variation of interior welding bead, bevel angle then become big because of groove section is long-pending above 55 °, and welding efficiency reduces.

By means of groove inner face tack welding, can reduce the gap variation in the welding.In addition,,, get final product, needn't use magnet and constraint utensil for soldered material bearing plate BP as long as be used in the less supporting force that the back side of soldered portion connects backing plate in the occasion of using ceramic solid-state backing material as backing plate BP.Therefore, can reduce labour intensity.Backing plate BP is except that with the ceramic solid-state backing material, uses any of the copper pad material that share with glass tape or solder flux (flux) copper pad, can both obtain identical effect.

In addition, the tack welding to the groove inner face also can be the total length or the part of weld seam.The location welding bead height with for stably produce welding bead, below 7mm, and for fully the location, be good more than 2mm.

Root gap is preferably in below the 5mm, is preferably in below the 3mm at the root face (with reference to Fig. 5) of Y groove, like this can long easily steel plate welding and have stable welding bead.When root gap surpasses 5mm, increase because of groove section is long-pending, so welding efficiency reduces.

When the welding current density of the unit welding wire sectional area of welding electrode welding wire 9f in advance less than 230A/mm ²The time, can not obtain stable interior welding bead.Especially, in the location division not welding portion can take place.

The welding current density of the unit welding wire sectional area of every back row welding electrode welding wire 9b is less than 130A/mm ²The time, it is bad through welding to take place.

In addition, welding electrode welding wire 9f adopts the mild steel of regulation among JIS Z 3312 and the Z 3325 and any solid welding wire that high strength steel is used, low-temperature steel is used in advance, can both obtain good effect, especially, require the occasion of high tenacity in weld metal, the solid welding wire of using with the low-temperature steel of regulation among the JIS Z 3325 is good.

Welding current density height because of every welding wire sectional area makes the shape of welding operation and interior welding bead good, and so that electrode wire 9f diameter is below the above 2.0mm of 1.4mm in advance, later column electrode welding wire 9b diameter is good below the above 2.0mm of 1.2mm.

For the shape of welding bead in making well, electrode wire 9f's (welding torch Tf) shakes number of times (inferior/minute) more than 40 times/minute below 150 times/minute in advance.Less than 40 times/minute, then welding bead waveform chap can not obtain good interior weld bead shape.Surpass 150 times/minute, then the electric arc instability can not obtain good interior weld bead shape.For the shape of welding bead in making well, back column electrode welding wire 9b (welding torch Tb) shakes number of times (inferior/minute), more than 30 times/minute below 120 times/minute.Less than 30 times/minute, then welding bead waveform chap can not obtain good interior weld bead shape.Surpass 120 times/minute, then the electric arc instability can not obtain good interior weld bead shape.

The width (vibration width) that shakes of electrode wire well is a purpose so that the welding bead surface is made,, change the piecewise corresponding to thickness of slab and change.About thickness of slab 10mm, the width that shakes of electrode wire 9f is 4mm in advance, and the width that shakes of back column electrode welding wire 9b is that 6mm is good, about thickness of slab 25mm, the width that shakes of electrode wire 9f is 10mm in advance, and the width that shakes of back column electrode welding wire 9b is that 15mm is good.

In advance, the interelectrode distance Dw (Fig. 7) between the column electrode welding wire of back is less than 100mm, then electric arc instability, and interior welding bead is too come out, and surpasses 600mm, though then improving on the toughness effectively, excessive because of installing, so can not be satisfactory.

In addition, corresponding to thickness of slab decision speed of welding, be below the above 45cm/min of 40cm/min in the occasion about thickness of slab 10mm, be below the above 20cm/min of 15cm/min in the occasion about thickness of slab 25mm, can be welded well.

Then, in bipolar electrode single face gas shielded arc welding of the present invention connects, the basis of using the composition qualification of the welding wire of the adding solder flux of column electrode welding wire 9b is afterwards described.

TiO ₂: more than 2.5% below 7.0%:

TiO ₂Though have as the character that forms agent and arc stabilizer for the welding slag of welding bead, less than 2.5%, can not obtain cap bead shape well for welding wire full weight amount.When surpassing 7.0%, oxygen content increases in weld metal, and because of large-scale non-metal mixture increases, so microstructure can not miniaturization, toughness reduces, so its scope is more than 2.5% below 7.0%.

ZrO ₂: more than 0.4% below 1.0%:

ZrO ₂Improved the setting rate of welding slag and the welding slag spreadability of motlten metal, and the welding bead outward appearance has been made well.Steam pressure at high temperature is low, the effect of the grain refined of molten drop is also arranged, the minimizing of splashing.But, less than 0.4%, can not obtain this effect, the cap bead outward appearance becomes bad, and the generating capacity that splashes is many.When surpassing 1.0%, the defective that takes place that welding slag is involved in easily because of setting temperature is high etc. is so its scope is more than 0.4% below 1.0%.

Al ₂O ₃: more than 0.1% below 1.0%:

Al ₂O ₃With ZrO ₂The welding slag that has improved the setting rate of welding slag and motlten metal in the same manner is by bag property, and the welding bead outward appearance is made well.But,, can not obtain this effect less than 0.1%.When surpassing 1.0%, because of the defective that takes place that welding slag is involved in etc., the fissility of welding slag is low, so its scope is more than 0.1% below 1.0%.

Si:0.2% is above below 1.2%:

Si has the effect that the oxygen content of weld metal is reduced as deoxidier.But, less than 0.2%, the not enough concurrent angry hole of deoxidation then.When surpassing 1.2%, because of making the sclerosis of ferrite solid, the toughness reduction is so its scope is more than 0.2% below 1.2%.

Mn:1.0% is above below 4.0%:

Mn assists deoxidation and improves the flowability of metal, when improving weld bead shape, the effect of improving strength and toughness is arranged also.But less than 1.0%, then not enough the and easy generation welding of deoxidation comes off.When surpassing 4.0%, because of weld metal deoxidation surplus, pit and bubble take place easily, so its scope is more than 1.0% below 4.0%.

Mg:0.1% is above below 1.0%:

Mg reacts with oxygen in the electric arc of high temperature, and carries out deoxygenation in the stage that the weldering of welding wire front end is dripped.Its result, the deoxidation product can not remain in the molten bath, and in addition, the deoxygenation of the helpful Si that reacts in fusion pool, Mn reduces the oxygen content of motlten metal and improves the effect of toughness.But, less than 0.1%, then aforesaid effect deficiency.When surpassing 1.0%, excessive because of arc length, the weld bead shape variation is so its scope is more than 0.1% below 1.0%.

Na, K:Na, the total of a kind of K or 2 kinds is more than 0.03% below 0.3%:

Na, K have the raising arc stability, relax the effect that excavates of mother metal.But,, then can not obtain aforesaid effect less than 0.3%.When surpassing 0.3%, long because of arc length, splashing amount, gas flow increase.

Require the occasion of low-temperature flexibility, in the welding wire of aforesaid adding solder flux, further in following scope, adding Ni, Ti and B.

Ni:0.3% is above below 3.0%

Add Ni and be used to guarantee low-temperature flexibility,, then can not obtain the effect of tough property improvement fully less than 0.3%.When surpassing 3.0%, the high temperature crack takes place easily, so its scope is more than 0.3% below 3.0%.

Ti:0.02% is above below 0.2%

Ti is strong deoxidier, can prevent the oxidation of weld metal, and utilizes the generation of Ti oxide, and what make weld metal littlely organizes miniaturization, and the effect of improving toughness is arranged.But,, then can not obtain miniaturization owing to little tissue and make the effect of tough property improvement less than 0.02%.When surpassing 0.2%, because of forming carbide and damage tolerance significantly, so its scope is more than 0.02% below 0.2%.

B:0.002% is above below 0.015%

B makes weld metal littlely organizes miniaturization, and the effect of improving toughness is arranged.But,, then can not obtain miniaturization owing to little tissue and make the effect of tough property improvement less than 0.002%.When surpassing 0.015%, because of cracking resistance worsens, form carbide and damage tolerance significantly simultaneously, so its scope is more than 0.002% below 0.015%.

In addition, organize miniaturization and improve toughness, can add in the scope below the Al:0.30%, below the Zr:0.20% in order further to make the little of weld metal.In addition, can add Cr below 2.5%, add Mo below 2%.

In double-electrode signle gas protective arc welding method of the present invention; because distribution steel grit or iron powder in groove; owing to use the darker steel welding wire of penetration among the electrode wire 9f in advance than the welding wire that adds solder flux; the current density height of every welding wire average cross-section; in addition; because of shaking electrode wire, the generating capacity that splashes is many.Therefore, effective in order to protect, reduce the generating capacity that splashes, at least the electrode wire 9f that goes ahead of the rest is adopted duplicate protection.

According to all welding conditions shown in the table 3, especially the many generating capacities that splashes of welding in advance of the generating capacity that splashes are investigated.

[table 3]

Classification	Content
		Soldered material	Steel grade: 490N/mm 2Grade high-strength steel, weld length 1000mm
Welding wire	Steel wire (1.6mm φ)
		Steel grit	(1.0mm φ * 1.0mm), distribution height: 8mm
Backing material	The solid-state backing material of pottery
		Gas flow	CO 2: 25l/min (inboard and the outside be duplicate protection all)
Welding condition	Electric current: 300A, 400A, 500A voltage: 30V, 41V, 44V speed: 30cm/min
		Shake width and vibration number	Shake width: 5mm, shake number of times: 120 times/minute
The groove shape	16mm (bevel angle: 50 ° of V root gap: 0-1mm, inner face tack welding height: 5mm)

Make electric current be divided into 300A, 400A, a 500A3 stage and change, the generating capacity that splashes of the occasion of in the past method (single sealing) and duplicate protection is investigated.

Usually, because of the generating capacity that splashes of in the past method increases along with the increase of electric current, be about 2.0～5.0g/min, so below it, be evaluated as good.Figure 8 shows that welding current and the relation of the generating capacity that splashes.When duplicate protection, compare with method (single protection) in the past, irrelevant with the electric current variation, splash generating capacity below 2.0g/min.Below, the embodiment and the comparative example of double-electrode signle gas protective arc welding method of the present invention described.

Embodiment 1

First column electrode (9f) shown in steel shown in the his-and-hers watches 4 and the table 5 makes up with the welding wire of the adding solder flux of back column electrode (9b) usefulness shown in steel welding wire and the table 6; with the distribution and the welding condition of groove shape, steel grit or the iron powder shown in table 7～table 12, the bipolar electrode single face gas shielded arc welding that carries out weld length 1500mm connects.Speed of welding is carried out below the above 450m/min of 15m/min corresponding to thickness of slab.In addition, usefulness submerged arc welding rod in 6 places, carries out the tack welding of length 30mm in the groove every 300mm.

After welding, to the outward appearance of surface glue back bead, have free from flaw and impact value to investigate.The thickness of slab central portion of the test body after the welding, gather the impact test sheet of No. 2,202 4, JIS Z and measure its impact value at 0 ℃.

In addition, investigate free from flaw is arranged, and investigation result concentrated be illustrated in table 7～table 12 with soaking into crank detection test and grand section.In addition, table 7～table 12 is that a big table is separated into 6 parts, and arranges these tables as follows:

Table 7 table 9 table 11

Table 8 table 10 table 12

By means of the repetition tabulation part in the neighboar lists is overlapped, and and come on same, just become a big table.

[table 4]

Steel grade	Thickness of slab (mm)	Chemical composition (%)
							C Si Mn P S
		SM490B
	12		0.13	0.30	1.31	0.012	0.008
								16	0.14	0.29	1.32	0.011	0.007
	20		0.15	0.30	1.30	0.011	0.007
								25	0.14	0.31	1.31	0.012	0.007

[table 5]

No.	Component of weld wire (wt%)
									C	Si	Mn	P	S	Mo	Ti	B
	W1	0.06	0.70	1.90	0.005	0.003	0.20	0.15									0.0060
W2									0.07	0.80	1.50	0.012	0.008	-	0.5	-

[table 6]

No.	Filling flux composition (wt%)
												The alloy deoxidizer agent					The welding slag agent			Arc stabilizer		Other
	Si	Mn	Mg	Cr	Mo	TiO 2	ZrO 2	Al 2O 3	Na	K
												F1	0.6	2.3	0.3	-	-	5.5	0.9	0.3	0.05	0.06	5.3
F2	0.4	3.5	0.2	-	-	6.8	0.6	0.3	0.04	0.07	5.2
												F3	0.7	2.0	0.5	-	-	5.6	0.5	0.2	0.17	0.10	5.5
F4	1.1	1.2	0.9	0.5	0.5	3.1	0.5	0.9	0.03	0.02	5.7
												F5	0.1	0.6	0.3	-	-	5.0	0.6	0.3	0.04	0.06	8.0
F6	1.3	1.8	1.5	-	0.5	5.2	0.5	0.3	0.05	0.06	3.8
												F7	0.5	4.5	0.6	-	-	6.0	0.4	0.3	0.18	0.20	2.3
F8	0.5	2.0	0.05	-	-	6.3	0.4	0.3	0.01	0.01	5.4
												F9	.06	2.5	0.5	-	0.5	2.0	0.5	0.3	0.05	0.06	8.0
F10	0.7	2.3	0.4	-	0.5	9.2	0.6	0.3	0.04	0.07	0.9
												F11	0.5	2.5	0.4	-	0.2	5.2	0.3	0.3	0.05	0.06	5.5
F12	0.6	2.5	0.5	-	0.5	5.5	1.3	0.3	0.04	0.06	3.7
												F13	0.6	2.5	0.5	-	0.5	5.1	0.4	0.05	0.05	0.06	5.2
F14	0.7	2.3	0.4	-	0.5	6.0	0.5	1.45	0.04	0.06	3.1

Other is TiO for (notes) ₂, ZrO ₂, Al ₂O ₃In addition welding slag agent and iron powder

[table 7]

Classification	No.	The groove shape					Steel grit or iron powder
										Thickness of slab (mm)	Shape	Angle (°)	Root face (mm)	Gap (mm)	Kind	Size	Abundance (mm)
		Example of the present invention	1	16	V	55	-	0	Steel grit									1mmφ×1mm	8
2	16									V	40	-	1	Iron powder	＜500μm	7
			3	12	V	50	-	1	Steel grit								1mmφ×1mm	6
4	20									V	50	-	1	Steel grit	1mmφ×1mm	9
			5	20	V	30	-	1	Steel grit								1mmφ×1mm	8
6	25									V	50	-	0	Steel grit	1mmφ×1mm	7
			7	25	Y	35	2	0	Iron powder								＜500μm	12
8	25									Y	50	2.5	1	Steel grit	1mmφ×1mm	10
			Comparative example	9	16	Y	50	-	0								Steel grit	1mmφ×1mm	3
10	12	V								50	-	1	Steel grit	1mmφ×1mm	9
				11	16	V	60	-	0							Steel grit	1mmφ×1mm	8
12	16	V								25	-	0	Steel grit	1mmφ×1mm	7
				13	16	V	50	-	0							Steel grit	1mmφ×1mm	8
14	16	V								50	-	0	Steel grit	1mmφ×1mm	8
				15	16	V	50	-	0							Steel grit	1mmφ×1mm	8
16	16	V								50	-	0	Steel grit	1mmφ×1mm	8

Annotate:

No.1-3, No.6-28 use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

[table 8]

Classification	No.	The groove shape					Steel grit or iron powder
										Thickness of slab (mm)	Shape	Angle (°)	Root face (mm)	Gap (mm)	Kind	Size	Abundance (mm)
		Comparative example	17	16	V	50	-	0	Steel grit									1mmφ×1mm	8
18	20									V	50	-	0	Steel grit	1mmφ×1mm	10
			19	16	V	50	-	0	Steel grit								1mmφ×1mm	8
20	16									V	50	-	0	Steel grit	1mmφ×1mm	8
			21	16	V	50	-	0	Steel grit								1mmφ×1mm	8
22	16									V	50	-	0	Steel grit	1mmφ×1mm	8
			23	16	V	50	-	0	Steel grit								1mmφ×1mm	8
24	16									V	50	-	0	Steel grit	1mmφ×1mm	8
			25	16	V	50	-	0	Steel grit								1mmφ×1mm	8
26	20									V	50	-	0	Steel grit	1mmφ×1mm	10
			27	16	V	50	-	0	Steel grit								1mmφ×1mm	8
28	16									V	50	-	0	Steel grit	1mmφ×1mm	8

Annotate:

No.1-3, No.6-28 use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

[table 9]

Classification	No.	Electrode	Interelectrode distance (mm)	Welding wire		Welding condition
									Kind	Size (mm)	Current density (A/mm 2)	Electrode orbiting
				Number of times (inferior/minute)	Width (mm)
						Example of the present invention	1	L				300	W1	1.6	270	140	6
T	F1	1.6	160	80	8
								2	L	600	W2		1.6	270	100	5
T	F2	1.6	160	70	7
							3		L		300	W1	1.4	250	80	5
T	F2	1.2	180	100	7
								4	L	200		W2	1.6	280	50	8
T	F3	1.6	200	90	10
							5		L		250	W1	1.6	290	90	6
T	F2	1.6	160	40	9
								6	L	100		W1	2.0	240	110	10
T	F4	2.0	200	80	15
							7		L		300	W1	1.6	290	90	8
T	F4	2.0	230	100	12
								8	L	300		W1	1.6	280	120	8
T	F4	1.6	250	80	11
							Comparative example		9		L	300	W2	1.6	280	80	5
T	F2	1.6	170	70	10
						10		L		300	W1		1.4	230	100	5
T	F1	1.2	160	70	7
								11	L		300	W1	1.6	270	120	7
T	F6	1.6	160	70	13
						12			L	300		W1	1.4	220	90	5
T	F5	1.6	180	100	7
								13	L		300	W1	1.6	280	120	5
T	F7	1.6	170	100	8
						14			L	300		W1	1.6	280	120	5
T	F8	1.6	170	100	8
								15	L		300	W1	1.6	184	90	5
T	F2	1.6	210	90	8
						16			L	300		W1	1.6	280	90	5
T	F1	1.6	134	90	8

Annotate:

No.1-3, No.6-28 use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

[table 10]

Classification	No.	Electrode	Interelectrode distance (mm)	Welding wire		Welding condition
									Kind	Size (mm)	Current density (A/mm 2)	Electrode orbiting
				Number of times (inferior/minute)	Width (mm)
						Comparative example	17	L				200	W2	1.6	270	34	5
T	F3	1.6	210	90	8
								18	L	300	W1		1.6	280	110	5
T	F1	1.6	210	26	8
							19		L		300	W2	1.6	270	162	5
T	F2	1.6	210	90	8
								20	L	300		W1	1.6	270	90	7
T	F1	1.6	210	128	12
							21		L		80	W1	1.6	270	90	5
T	F1	1.6	210	90	8
								22	L	300		W1	1.6	270	90	5
T	F9	1.6	210	90	8
							23		L		300	W1	1.6	270	90	5
T	F10	1.6	210	90	8
								24	L	300		W1	1.6	270	90	5
T	F11	1.6	210	90	8
							25		L		300	W1	1.6	270	110	5
T	F12	1.6	210	90	8
								26	L	200		W2	1.6	280	100	7
T	F13	1.6	210	90	12
							27		L		300	W1	1.6	270	90	5
T	F14	1.6	210	90	8
								28	L	300		W1	1.6	280	90	5
T	F1	1.6	210	90	8

Annotate:

No.1-3, No.6-28 use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

[table 11]

Classification	No.	Welding result				Overall merit
							The cap bead outward appearance	The back bead outward appearance	Free from flaw is arranged	Impact value vEO (J)
		Example of the present invention	1	Well	Well						Do not have	68	○
2	Well					Well	Do not have	76	○
			3	Well	Well					Do not have	64	○
4	Well					Well	Do not have	62	○
			5	Well	Well					Do not have	74	○
6	Well					Well	Do not have	72	○
			7	Well	Well					Do not have	72	○
8	Well					Well	Do not have	85	○
			Comparative example	9	Burn					-	-	×
10	Well	Bad					-	-	×
				11	Groove is wide bad	Well				Do not have	22	×
12	Gassing	Bad					-	-	×
				13	Gassing	Well				-	-	×
14	The electric arc instability, bad	Well					Do not have	24	×
				15	Well	Bad				Do not have	-	×
16	Bad	Well					Do not have	-	×

Annotate:

O.6-28, No.1-3, N use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

[table 12]

Classification	No.	Welding result				Overall merit
							The cap bead outward appearance	The back bead outward appearance	Free from flaw is arranged	Impact value vEO (J)
		Comparative example	17	Well	Bad						Have	-	×
18	Bad					Well	Do not have	-	×
			19	Well	Bad					Do not have	-	×
20	The electric arc instability, bad					Well	Do not have	-	×
			21	The electric arc instability, bad	Grill thoroughly					Do not have	-	×
22	Bad					Well	Do not have	-	×
			23	Well	Well					Do not have	20	×
24	It is many to splash, bad					Well	Do not have	-	×
			25	The generation welding slag is involved in	Well					Do not have	-	×
26	Bad					Well	Do not have	-	×
			27	The generation welding slag is involved in	Well					Do not have	-	×
28	The generating capacity that splashes is many					-	-	-	×

Annotate:

No.1-3, No.6-28 use ceramic solid-state backing material.

No.4 uses the shared copper coin backing material of glass tape.

No.5 uses solder flux copper pad material.

No.1-4 and No.9-14 are to carry out duplicate protection with the back column electrode in advance.

No.5-8 and No.15-27 only carry out duplicate protection to first column electrode.

No.28 only is protection in the past.

No.1 in table 7～table 12～8th, the embodiment of employing welding method of the present invention, No.9～28th, comparative example.No.1～8 as the embodiment of the invention; because of the component of weld wire that shakes number of times, welding current density and back row welding electrode 9b of the distribution height of groove shape, steel grit or iron powder, electrode suitable; and the duplicate protection welding electrode welding wire 9f that goes ahead of the rest at least; so have surface and back bead outward appearance all good; the defective that does not have high temperature crack etc., the result that impact value is also extremely good.

The abundance of No.9 invar grain is low in the comparative example, so burning of weld metal can be taken place.The abundance height of No.10 invar grain is not so back bead comes out.The No.11 groove is wide, based on the accumulation of welding less, interior welding bead is too outstanding.In addition, because of the Si content height of back column electrode welding wire 9b (F6), so toughness is low, because of Mg content height, so the outward appearance of cap bead becomes bad.No.12 is narrow because of bevel angle, so interior welding bead becomes inhomogeneous, because of Si and the Mn content of back column electrode welding wire 9b (F5) are low, so gassing.

No.13 is because of the Mn height of back column electrode welding wire 9b (F7), so gassing.In addition, because of the total amount of Na, K is many, so the generating capacity that splashes is many.

No.14 is few because of the Mg of back column electrode welding wire 9b (F8), so poor toughness.In addition, because of the total amount of Na, K is few, so the electric arc instability, it is bad that cap bead becomes.

No.15 is low because of the welding current density of the electrode wire 9f that goes ahead of the rest, so interior welding bead does not come out.

No.16 is low because of the welding current density of back column electrode welding wire 9b, so the bad order of interior welding bead.

No.17 because of electrode wire 9f in advance to shake number of times few, so interior welding bead is uneven.

No.18 because of back column electrode welding wire 9b to shake number of times few, so the bad order of interior welding bead.

No.19 shakes often because of the electrode wire 9f's that goes ahead of the rest, so the electric arc instability, interior welding bead is uneven.

No.20 shakes often because of back column electrode welding wire 9b's, so the electric arc instability, cap bead is bad.

No.21 is because of the anode-cathode distance Dw with back column electrode welding wire 9f, 9b is little in advance, so the electric arc instability takes place by burning of weld metal.

No.22 is because of the TiO of back column electrode welding wire 9b (F9) ₂Few, so the bad order of cap bead.

No.23 is because of the TiO of back column electrode welding wire 9b (F10) ₂Many, so poor toughness.

No.24 is because of the ZrO of back column electrode welding wire 9b (F11) ₂Few, thus poor to the welding slag of motlten metal by bag property, the bad order of cap bead, the generating capacity that splashes is also many.

No.25 is because of the ZrO of back column electrode welding wire 9b (F12) ₂Many, so taking place, welding slag is involved in.

No.26 is because of the Al of back column electrode welding wire 9b (F13) ₂O ₃Few, thus poor to the welding slag of motlten metal by bag property, the bad order of cap bead.

No.27 is because of the Al of back column electrode welding wire 9b (F14) ₂O ₃Many, be involved in defective so welding slag takes place, and welding slag is peeled off variation.

No。27 because of there not being duplicate protection, so the generating capacity that splashes is many.

Embodiment 2

The welding wire of the adding solder flux shown in steel welding wire shown in cryogenic steel material shown in the his-and-hers watches 13 and the table 5 and the table 14 makes up, and is 1 identical with embodiment, carry out bipolar electrode single face gas shielded arc welding and connect.In addition, also duplicate protection is in advance and back column electrode welding wire 9f, 9b in each test.In addition ,-20 ℃ impact value is investigated in the evaluation of toughness.To be illustrated in table 15, table 16, the table 17 in its result set.

Table 15～table 17 is that a big table is separated into 3 parts, and arranges these tables as follows:

Table 15 table 16 table 17

By means of the repetition tabulation part in the neighboar lists is overlapped, and and come on same, just become a big table.

[table 13]

Steel grade	Thickness of slab (mm)	Chemical composition (%)
								C	Si	Mn	P	S	V
		Cryogenic steel KE32	16	0.15	0.35	1.35	0.011							0.010	0.05

[table 14]

No.	Filling flux (wt%)
																	The alloy deoxidizer agent										The welding slag agent			Arc stabilizer		Other
	Si	Mn	Mg	Ni	Cr	Mo	Al	Ti	Zr	B	TiO 2	ZrO 2	Al 2O 3	Na	K
																F15	0.6	2.2	0.3	2.5	-	-	0.20	0.15	-	0.003	5.6	0.5	0.3	0.05	0.06		5.2
F16	0.5	2.1	0.6	0.5	-	-	-	0.03	-	0.012	5.7	0.6	0.3	0.04	0.07																	4.6
																F17	0.6	2.0	0.5	1.5	-	-	-	0.05	-	0.010	5.6	0.5	0.2	0.07	0.06		3.9
F18	0.7	2.3	0.4	0.3	0.5	0.5	-	0.08	0.05	0.008	4.3	0.5	0.4	0.05	0.06																	5.2
																F19	0.6	2.5	0.5	0.2	-	0.5	0.15	0.05	-	0.010	5.2	0.4	0.3	0.05	0.06		4.6
F20	0.7	2.3	0.4	3.5	-	0.5	-	0.05	-	0.010	5.5	0.5	0.3	0.04	0.06																	1.1
																F21	0.5	2.5	0.4	0.4	-	0.2	-	0.01	-	0.010	5.5	0.5	0.3	0.05	0.06		5.0
F22	0.6	2.5	0.5	0.5	-	0.5	-	0.25	-	0.010	5.1	0.5	0.3	0.05	0.06																	4.1
																F23	0.5	2.5	0.4	2.0	-	0.5	-	0.18	-	0.001	5.1	0.5	0.3	0.04	0.06		5.1
F24	0.6	2.5	0.5	0.5	-	0.2	-	0.12	-	0.020	6.0	0.6	0.3	0.05	0.06																	3.7

Other is TiO for (notes) ₂, ZrO ₂, Al ₂O ₃In addition weldering host and iron powder

[table 15]

Classification	No.	The groove shape					Steel grit or iron powder
										Thickness of slab (mm)	Shape	Angle (°)	Root face (mm)	Gap (mm)	Kind	Size	Abundance (mm)
		Example of the present invention	29	16	V	50	-	1	Steel grit									1mmφ×1mm	9
30	16									V	50	-	1	Steel grit	1mmφ×1mm	6
			31	16	V	50	-	0	Steel grit								1mmφ×1mm	8
32	16									V	40	-	1	Steel grit	＜500μm	7
			33	16	Y	50	2	0	Iron powder								1mmφ×1mm	7
Comparative example	34									16	V	50	-	0	Steel grit	1mmφ×1mm			8
		35	16	V	50	-	0	Steel grit	1mmφ×1mm								7
	36									16	V	50	-	0	Steel grit	1mmφ×1mm		8
		37	16	V	50	-	0	Steel grit	1mmφ×1mm								9
	38									16	V	50	-	0	Steel grit	1mmφ×1mm		8
		39	16	V	50	-	0	Steel grit	1mmφ×1mm								8

Annotate:

No.29-31, No.34-39 use ceramic solid-state backing material.

No.32 uses the shared copper coin backing material of glass tape.

No.33 uses solder flux copper pad material.

Any all duplicate protections of No.29-39 are gone ahead of the rest and the back column electrode.

[table 16]

Classification	No.	Electrode	Interelectrode distance (mm)	Welding wire		Welding condition
									Kind	Size (mm)	Current density (A/mm 2)	Electrode orbiting
				Number of times (inferior/minute)	Width (mm)
						Example of the present invention	29	L				200	W1	1.6	280	50	6
T	F17	1.6	200	90	8
								30	L	300	W1		1.4	230	80	5
T	F15	1.2	180	100	7
							31		L		300	W1	1.6	270	140	6
T	F16	1.6	160	70	8
								32	L	500		W1	1.6	270	100	5
T	F17	1.6	160	80	8
							33		L		150	W1	2.0	230	110	6
T	F18	2.0	230	80	9
								Comparative example	34	L		300	W1	1.6	270	90	5
T	F20	1.6	210	90	8
						35	L			300	W1		1.6	270	90	5
T	F19	1.6	210	90	8
							36		L		300	W1	1.6	270	100	5
T	F23	1.6	210	90	8
						37			L	300		W1	1.6	270	110	5
T	F21	1.6	210	80	8
							38		L		300	W1	1.6	270	120	5
T	F22	1.6	210	80	8
						39			L	300		W1	1.6	270	80	5
T	F24	1.6	210	90	8

Annotate:

No.29-31, No.34-39 use ceramic solid-state backing material.

No.32 uses the shared copper coin backing material of glass tape.

No.33 uses solder flux copper pad material.

Any all duplicate protections of No.29-39 are gone ahead of the rest and the back column electrode.

[table 17]

Classification	No.	Welding result				Overall merit
							The cap bead outward appearance	The back bead outward appearance	Free from flaw is arranged	Impact value vE-20 (J)
		Example of the present invention	29	Well	Well						Do not have	86	○
30	Well					Well	Do not have	62	○
			31	Well	Well					Do not have	64	○
32	Well					Well	Do not have	80	○
			33	Well	Well					Do not have	72	○
Comparative example	34					Well	Well	Do not have	-				×
		35	Well	Well	Do not have					32	×
	36					Well	Well	Do not have	26			×
		37	Well	Well	Do not have					27	×
	38					Well	Well	Do not have	20			×
		39	Well	Well	Have					-	×

Annotate:

No.29-31, No.34-39 use ceramic solid-state backing material.

No.32 uses the shared copper coin backing material of glass tape.

No.33 uses solder flux copper pad material.

Any all duplicate protections of No.29-39 are gone ahead of the rest and the back column electrode.

No.29 in table 15～table 17～33rd, the embodiment of employing welding method of the present invention, No.34～39th, comparative example.No.29～33 as the embodiment of the invention; because of the filling flux composition that shakes number of times, welding current density and back row welding electrode welding wire 9b (F15～F18: table 14) of the distribution height of groove shape, steel grit or iron powder, electrode suitable; and duplicate protection is gone ahead of the rest and back row welding electrode welding wire 9f, 9b at least; so have surface and back bead outward appearance all good; the defective that does not have high temperature crack etc., the result that impact value is also extremely good.

No.34 is few because of the Ni of back column electrode welding wire 9b (F19) in the comparative example, so poor toughness.

No.35 is many because of the Ni of back column electrode welding wire 9b (F20), so the high temperature crack takes place.

No.36 is few because of the Ti of back column electrode welding wire 9b (F21), so poor toughness.

No.37 is many because of the Ti of back column electrode welding wire 9b (F22), so poor toughness.

No.38 is few because of the B of back column electrode welding wire 9b (F23), so poor toughness.

No.39 is many because of the B of back column electrode welding wire 9b (F24), so the high temperature crack takes place.

As previously mentioned, adopt the present invention, then for single-sided welding from short size to the welding structure thing of long size, it is good to obtain welding operation, cracking resistance and the back side and cap bead, the weld zone of complete high tenacity, it is long-pending to dwindle simultaneously groove section, because of not needing delegation's welding of complicated operations in the welding, so can easily improve long steel plate welding operation efficient significantly.

Claims (21)

1 one kinds of bipolar electrode single face gas shielded arc welding tippings are put, and it is characterized in that, comprising:

To extend, on the Y direction, be provided with groove and 2 blocks of relative soldered materials at directions X, at this groove part go ahead of the rest the gas shielded arc welding torch of welding and the gas shielded arc welding torch that the back row welds;

In fact abreast be installed in certain guide rails on one side of described 2 blocks of soldered materials with described groove;

The running gear that support described welding torch, moves with described rail guidance and on directions X;

Be equipped on this running gear, support described welding torch and on the Y direction, drive shake drive unit;

Welding current is supplied with the welding supply of described welding torch;

The control device that drive unit, welding supply and running gear are controlled is shaken in described welding;

Supply with the specified device of action indicated value to this control device;

, on the first line position of welding torch in advance, cross over described groove and contact with described two blocks of soldered materials or magnetic member that approaching magnetic circuit is used along the direction that should move;

With magnetic member that keeps this magnetic circuit to use and the jockey that is connected to described running gear.

2 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, and it is characterized in that the magnetic member that described magnetic circuit is used comprises:

The lower end touches on the soldered material, long and be distributed in the thin magnetic plate that a plurality of legs on the directions X are used on the Z direction;

Insert between these plates, be placed on and soldered material between the space of broadness, short and be distributed in the thin magnetic plate of a plurality of Zhi Ganyong on the directions X on the Z direction;

Support the device for supporting of the thin magnetic plate of described pin usefulness and Zhi Ganyong.

3 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, and it is characterized in that the magnetic member that described magnetic circuit is used comprises thicker steel plate and the inclination joint freely that this steel plate is connected with described jockey.

4 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put; it is characterized in that the magnetic member that described magnetic circuit is used is included in the extension of Y direction, a plurality of magnetic roll shafts that distribute, rotates and support their framework and the inclination joint freely that this framework is connected with described jockey freely on directions X.

5 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, and it is characterized in that, the magnetic member that described magnetic circuit is used is included in the extension of Y direction, a plurality of steel plates that distribute and tilts to support freely their framework on directions X.

6 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, and it is characterized in that described jockey comprises:

Be connected and upwardly extending sliding component with the magnetic member that described magnetic circuit is used in Z side;

With on the Z direction movably, support the slide guide device of this sliding component.

7 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put; it is characterized in that; contacting or approaching member with soldered material of the magnetic member that described magnetic circuit is used, the direction of going ahead of the rest to the welding torch of going ahead of the rest on the moving direction of running gear tilts.

8 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, it is characterized in that,

Described control device comprises and is used for the signal receiver side connector that is electrically connected with described specified device;

Described specified device be comprise a plurality of variable resistances of the electric signal that expression action indicated value takes place and have is connected with variable resistance respectively, with the welding condition given disc of the signal transmission side-connector of the link of the link disengaging of described signal receiver side connector.

9 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 8 are put, it is characterized in that,

Described a plurality of variable resistance comprises and is used to supply with the variable resistance that shakes rate indicative signal, is used to supply with variable resistance, the variable resistance that is used to supply with the welding current index signal that shakes the width index signal, the variable resistance that is used to supply with the variable resistance of weldingvoltage index signal and is used to supply with speed of travel index signal.

10 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 8 are put, and it is characterized in that, described each resistor is the variable resistance that has the locking mechanism of the moving part motion that locks resistance value setting usefulness.

11 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 8 are put, and it is characterized in that, described each variable resistance is a variable resistance of having settled the dial type of knob on the rotation moving part of resistance value setting usefulness.

12 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put, and it is characterized in that, also comprise the filling metal feedway of to fill metal and being connected with described running gear in order to put in described groove.

13 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 1 are put; it is characterized in that; described guide rail also comprises: put with the distance of regulation on the Y direction, be connected 2 guide rails that directions X extends abreast and be dispersed in multiple spot on the directions X a bit on be fixed on described 2 guide rails; and on other aspect, on directions X, relatively slide, at the connecting plate that is combined in to the chucking relation described 2 guide rails on described 2 guide rails on the Y direction in fact.

14 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 13 are put; it is characterized in that; the connecting plate of described guide rail; be distributed in multiple spot on the directions X a bit on utilize stop screw to be fixed on described 2 guide rails; and on other aspect, pass the long slotted hole on directions X of connecting plate; the screw that utilization screws in guide rail relatively slides on directions X, is being combined on described 2 guide rails to the chucking relation in fact on the Y direction.

15 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 13 are put; it is characterized in that; described guide rail also further comprises: be distributed in multiple spot on the directions X a bit on be fixed on the connecting plate; and on other aspect, on directions X, relatively slide, on the Y direction, in fact the chucking relation be combined in the tooth bar on the connecting plate.

16 bipolar electrode single face gas shielded arc welding tippings as claimed in claim 15 are put; it is characterized in that; described tooth bar; be distributed in multiple spot on the directions X a bit on utilize stop screw to be fixed on the connecting plate; and on other aspect, pass the long slotted hole on directions X of connecting plate; the screw that utilization screws in tooth bar relatively slides on directions X, is combined on the connecting plate to the chucking relation in fact on the Y direction.

17 1 kinds of double-electrode signle gas protective arc welding methods; it is characterized in that; at the Y of 30～55 ° of the bevel angles of soldered material or the groove place overlap joint backing material of V-arrangement; in this groove, fill steel grit or iron powder the height below 2/3 more than 1/4 to soldered material thickness of slab; and put when this groove carried out single-sided welding with the described bipolar electrode single face of claim 1 gas shielded arc welding tipping; order in advance and the anode-cathode distance between the welding electrode welding wire of back row below the above 600mm of 100mm, in advance and the welding current density of the welding electrode welding wire of back row respectively at 230A/mm ²More than and 150A/mm ²More than, and with more than 40 times/minute below 150 times/minute and more than 30 times/minute below 120 times/minute, shake and drive in advance and the welding electrode welding wire of back row respectively.

18 double-electrode signle gas protective arc welding methods as claimed in claim 17 is characterized in that, described groove is the groove of location welding inner face.

19 double-electrode signle gas protective arc welding methods as claimed in claim 17 is characterized in that, described back row welding electrode welding wire contains percentage by weight for the welding wire total weight and is:

TiO ₂: more than 2.5% below 7.0%

ZrO ₂: more than 0.4% below 1.0%

Al ₂O ₃: more than 0.1% below 1.0%

Si:0.2% is above below 1.2%

Mn:1.0% is above below 4.0%

Mg:0.1% is above below 1.0%

And be the welding wire that contains solder flux that adds up to the solder flux below 0.3% more than 0.03% of having filled a kind of of Na and K or 2 kinds.

20 double-electrode signle gas protective arc welding methods as claimed in claim 19 is characterized in that, described back row welding electrode welding wire has been filled for the welding wire total weight and contained percentage by weight and be:

Ni:0.3% is above below 3.0%

Ti:0.02% is above below 0.2%

B:0.002% is above below 0.015%

The welding wire that contains solder flux of solder flux.

21 double-electrode signle gas protective arc welding methods as claimed in claim 17 is characterized in that, at least with the 1st protective gas and the 2nd protective gas duplicate protection electrode wire of going ahead of the rest.

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